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<h3>

 Marge Bot pushed to branch master

at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>

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<h4>

Commits:

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<li>

<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf772f19c06944f0fd03b4bdcd4a49e437084ba5">cf772f19</a></strong>

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<span>by Sylvain Henry</span>

<i>at 2020-05-26T03:04:45-04:00</i>

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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enhance Note [About units] for Backpack

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<h4>1 changed file:</h4>

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<a href="#dda0490abed78f0a26a003f2bde76a7311d05c8e">

compiler/GHC/Unit.hs

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<h4>Changes:</h4>

<li id="dda0490abed78f0a26a003f2bde76a7311d05c8e">

<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cf772f19c06944f0fd03b4bdcd4a49e437084ba5#dda0490abed78f0a26a003f2bde76a7311d05c8e"><strong>compiler/GHC/Unit.hs</strong></a>

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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Unit.Subst</span></span>

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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Unit.Module</span></span>

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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [About Units]</span></span>

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<pre style="margin: 0;">-<span id="LC25" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ~~~~~~~~~~~~~~~~~~</span></span>

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<pre style="margin: 0;">-<span id="LC26" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC27" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Haskell users are used to manipulate Cabal packages. These packages are</span></span>

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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- identified by:</span></span>

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<pre style="margin: 0;">-<span id="LC29" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    - a package name :: String</span></span>

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<pre style="margin: 0;">-<span id="LC30" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    - a package version :: Version</span></span>

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<pre style="margin: 0;">-<span id="LC31" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    - (a revision number, when they are registered on Hackage)</span></span>

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<pre style="margin: 0;">-<span id="LC32" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC33" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Cabal packages may contain several components (libraries, programs,</span></span>

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<pre style="margin: 0;">-<span id="LC34" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- testsuites). In GHC we are mostly interested in libraries because those are</span></span>

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<pre style="margin: 0;">-<span id="LC35" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the components that can be depended upon by other components. Components in a</span></span>

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<pre style="margin: 0;">-<span id="LC36" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- package are identified by their component name. Historically only one library</span></span>

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<pre style="margin: 0;">-<span id="LC37" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- component was allowed per package, hence it didn't need a name. For this</span></span>

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<pre style="margin: 0;">-<span id="LC38" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- reason, component name may be empty for one library component in each</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- package:</span></span>

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<pre style="margin: 0;">-<span id="LC40" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    - a component name :: Maybe String</span></span>

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<pre style="margin: 0;">-<span id="LC41" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC42" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- UnitId</span></span>

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<pre style="margin: 0;">-<span id="LC43" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ------</span></span>

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<pre style="margin: 0;">-<span id="LC44" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC45" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Cabal libraries can be compiled in various ways (different compiler options</span></span>

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<pre style="margin: 0;">-<span id="LC46" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- or Cabal flags, different dependencies, etc.), hence using package name,</span></span>

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<pre style="margin: 0;">-<span id="LC47" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- package version and component name isn't enough to identify a built library.</span></span>

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<pre style="margin: 0;">-<span id="LC48" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We use another identifier called UnitId:</span></span>

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<pre style="margin: 0;">-<span id="LC49" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC50" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   package name             \</span></span>

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<pre style="margin: 0;">-<span id="LC51" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   package version          |                       ________</span></span>

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<pre style="margin: 0;">-<span id="LC52" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   component name           | hash of all this ==> | UnitId |</span></span>

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<pre style="margin: 0;">-<span id="LC53" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   Cabal flags              |                       --------</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC54" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   compiler options         |</span></span>

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<pre style="margin: 0;">-<span id="LC55" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--   dependencies' UnitId     /</span></span>

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<pre style="margin: 0;">-<span id="LC56" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC57" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Fortunately GHC doesn't have to generate these UnitId: they are provided by</span></span>

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<pre style="margin: 0;">-<span id="LC58" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- external build tools (e.g. Cabal) with `-this-unit-id` command-line parameter.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC59" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC60" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- UnitIds are important because they are used to generate internal names</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC61" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (symbols, etc.).</span></span>

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<pre style="margin: 0;">-<span id="LC62" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC63" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Wired-in units</span></span>

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<pre style="margin: 0;">-<span id="LC64" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- --------------</span></span>

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<pre style="margin: 0;">-<span id="LC65" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC66" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Certain libraries are known to the compiler, in that we know about certain</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC67" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- entities that reside in these libraries. The compiler needs to declare static</span></span>

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<pre style="margin: 0;">-<span id="LC68" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Modules and Names that refer to units built from these libraries.</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC69" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC70" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Hence UnitIds of wired-in libraries are fixed. Instead of letting Cabal chose</span></span>

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<pre style="margin: 0;">-<span id="LC71" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the UnitId for these libraries, their .cabal file uses the following stanza to</span></span>

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<pre style="margin: 0;">-<span id="LC72" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- force it to a specific value:</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC73" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC74" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    ghc-options: -this-unit-id ghc-prim    -- taken from ghc-prim.cabal</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC75" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="76" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC76" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- The RTS also uses entities of wired-in units by directly referring to symbols</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC77" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- such as "base_GHCziIOziException_heapOverflow_closure" where the prefix is</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC78" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the UnitId of "base" unit.</span></span>

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<pre style="margin: 0;">-<span id="LC79" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC80" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unit databases</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC81" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- --------------</span></span>

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82

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<pre style="margin: 0;">-<span id="LC82" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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83

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<pre style="margin: 0;">-<span id="LC83" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Units are stored in databases in order to be reused by other codes:</span></span>

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<pre style="margin: 0;">-<span id="LC84" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC85" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    UnitKey ---> UnitInfo { exposed modules, package name, package version</span></span>

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<pre style="margin: 0;">-<span id="LC86" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--                            component name, various file paths,</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC87" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--                            dependencies :: [UnitKey], etc. }</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC88" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC89" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Because of the wired-in units described above, we can't exactly use UnitIds</span></span>

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<pre style="margin: 0;">-<span id="LC90" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- as UnitKeys in the database: if we did this, we could only have a single unit</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC91" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (compiled library) in the database for each wired-in library. As we want to</span></span>

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<pre style="margin: 0;">-<span id="LC92" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- support databases containing several different units for the same wired-in</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC93" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- library, we do this:</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC94" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC95" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    * for non wired-in units:</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC96" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--       * UnitId = UnitKey = Identifier (hash) computed by Cabal</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC97" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC98" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    * for wired-in units:</span></span>

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<td class="diff-line-num old old_line" data-linenumber="99" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC99" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--       * UnitKey = Identifier computed by Cabal (just like for non wired-in units)</span></span>

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<pre style="margin: 0;">-<span id="LC100" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--       * UnitId  = unit-id specified with -this-unit-id command-line flag</span></span>

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<td class="diff-line-num old old_line" data-linenumber="101" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC101" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<td class="diff-line-num old old_line" data-linenumber="102" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC102" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We can expose several units to GHC via the `package-id <UnitKey>`</span></span>

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<pre style="margin: 0;">-<span id="LC103" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- command-line parameter. We must use the UnitKeys of the units so that GHC can</span></span>

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<td class="diff-line-num old old_line" data-linenumber="104" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC104" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- find them in the database.</span></span>

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<td class="diff-line-num old old_line" data-linenumber="105" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC105" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC106" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GHC then replaces the UnitKeys with UnitIds by taking into account wired-in</span></span>

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<pre style="margin: 0;">-<span id="LC107" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- units: these units are detected thanks to their UnitInfo (especially their</span></span>

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<pre style="margin: 0;">-<span id="LC108" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- package name).</span></span>

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<pre style="margin: 0;">-<span id="LC109" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC110" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- For example, knowing that "base", "ghc-prim" and "rts" are wired-in packages,</span></span>

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<pre style="margin: 0;">-<span id="LC111" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the following dependency graph expressed with UnitKeys (as found in the</span></span>

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<pre style="margin: 0;">-<span id="LC112" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- database) will be transformed into a similar graph expressed with UnitIds</span></span>

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<pre style="margin: 0;">-<span id="LC113" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (that are what matters for compilation):</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC114" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC115" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    UnitKeys</span></span>

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<pre style="margin: 0;">-<span id="LC116" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    ~~~~~~~~                             ---> rts-1.0-hashABC <--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC117" class="line" lang="haskell"><span class="cd">--                                         |                      |</span></span>

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<pre style="margin: 0;">-<span id="LC118" class="line" lang="haskell"><span class="cd">--                                         |                      |</span></span>

</pre>

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119

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<pre style="margin: 0;">-<span id="LC119" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    foo-2.0-hash123 --> base-4.1-hashXYZ ---> ghc-prim-0.5.3-hashABC</span></span>

</pre>

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120

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<pre style="margin: 0;">-<span id="LC120" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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121

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<pre style="margin: 0;">-<span id="LC121" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    UnitIds</span></span>

</pre>

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122

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<pre style="margin: 0;">-<span id="LC122" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    ~~~~~~~                              ---> rts <--</span></span>

</pre>

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123

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<pre style="margin: 0;">-<span id="LC123" class="line" lang="haskell"><span class="cd">--                                         |          |</span></span>

</pre>

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124

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<pre style="margin: 0;">-<span id="LC124" class="line" lang="haskell"><span class="cd">--                                         |          |</span></span>

</pre>

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125

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<pre style="margin: 0;">-<span id="LC125" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    foo-2.0-hash123 --> base ---------------> ghc-prim</span></span>

</pre>

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126

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<pre style="margin: 0;">-<span id="LC126" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="127" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC127" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="128" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

128

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<pre style="margin: 0;">-<span id="LC128" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Module signatures / indefinite units / instantiated units</span></span>

</pre>

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129

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<pre style="margin: 0;">-<span id="LC129" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ---------------------------------------------------------</span></span>

</pre>

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130

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<pre style="margin: 0;">-<span id="LC130" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

131

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<pre style="margin: 0;">-<span id="LC131" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GHC distinguishes two kinds of units:</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC132" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

133

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<pre style="margin: 0;">-<span id="LC133" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    * definite: units for which every module has an associated code object</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="134" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

134

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<pre style="margin: 0;">-<span id="LC134" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    (i.e. real compiled code in a .o/.a/.so/.dll/...)</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="135" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

135

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<pre style="margin: 0;">-<span id="LC135" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="136" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

136

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<pre style="margin: 0;">-<span id="LC136" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    * indefinite: units for which some modules are replaced by module</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="137" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

137

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<pre style="margin: 0;">-<span id="LC137" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    signatures.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="138" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

138

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<pre style="margin: 0;">-<span id="LC138" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="139" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

139

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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Module signatures are a kind of interface (similar to .hs-boot files). They</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="140" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

140

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<pre style="margin: 0;">-<span id="LC140" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- are used in place of some real code. GHC allows real modules from other</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="141" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

141

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<pre style="margin: 0;">-<span id="LC141" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- units to be used to fill these module holes. The process is called</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="142" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

142

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<pre style="margin: 0;">-<span id="LC142" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "unit/module instantiation".</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="143" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

143

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<pre style="margin: 0;">-<span id="LC143" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="144" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

144

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<pre style="margin: 0;">-<span id="LC144" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- You can think of this as polymorphism at the module level: module signatures</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="145" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

145

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<pre style="margin: 0;">-<span id="LC145" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- give constraints on the "type" of module that can be used to fill the hole</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="146" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

146

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<pre style="margin: 0;">-<span id="LC146" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- (where "type" means types of the exported module entitites, etc.).</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="147" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

147

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<pre style="margin: 0;">-<span id="LC147" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="148" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

148

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<pre style="margin: 0;">-<span id="LC148" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Module signatures contain enough information (datatypes, abstract types, type</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="149" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

149

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<pre style="margin: 0;">-<span id="LC149" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- synonyms, classes, etc.) to typecheck modules depending on them but not</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="150" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

150

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<pre style="margin: 0;">-<span id="LC150" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- enough to compile them. As such, indefinite units found in databases only</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="151" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

151

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<pre style="margin: 0;">-<span id="LC151" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- provide module interfaces (the .hi ones this time), not object code.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="152" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

152

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<pre style="margin: 0;">-<span id="LC152" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="153" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

153

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<pre style="margin: 0;">-<span id="LC153" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- To distinguish between indefinite and finite unit ids at the type level, we</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="154" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

154

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<pre style="margin: 0;">-<span id="LC154" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- respectively use 'IndefUnitId' and 'DefUnitId' datatypes that are basically</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="155" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

155

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<pre style="margin: 0;">-<span id="LC155" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- wrappers over 'UnitId'.</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="156" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

156

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<pre style="margin: 0;">-<span id="LC156" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="157" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

157

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<pre style="margin: 0;">-<span id="LC157" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Unit instantiation</span></span>

</pre>

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158

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<pre style="margin: 0;">-<span id="LC158" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ------------------</span></span>

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<pre style="margin: 0;">-<span id="LC159" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<td class="diff-line-num old old_line" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

160

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<pre style="margin: 0;">-<span id="LC160" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Indefinite units can be instantiated with modules from other units. The</span></span>

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<pre style="margin: 0;">-<span id="LC161" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- instantiating units can also be instantiated themselves (if there are</span></span>

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<td class="diff-line-num old old_line" data-linenumber="162" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC162" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- indefinite) and so on. The 'Unit' datatype represents a unit which may have</span></span>

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<pre style="margin: 0;">-<span id="LC163" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- been instantiated:</span></span>

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<pre style="margin: 0;">-<span id="LC164" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<td class="diff-line-num old old_line" data-linenumber="165" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC165" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    data Unit = RealUnit DefUnitId</span></span>

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<pre style="margin: 0;">-<span id="LC166" class="line" lang="haskell"><span class="cd">--              | VirtUnit InstantiatedUnit</span></span>

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<pre style="margin: 0;">-<span id="LC167" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<td class="diff-line-num old old_line" data-linenumber="168" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC168" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'InstantiatedUnit' has two interesting fields:</span></span>

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<pre style="margin: 0;">-<span id="LC169" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC170" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    * instUnitInstanceOf :: IndefUnitId</span></span>

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<pre style="margin: 0;">-<span id="LC171" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--       -- ^ the indefinite unit that is instantiated</span></span>

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<pre style="margin: 0;">-<span id="LC172" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC173" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    * instUnitInsts :: [(ModuleName,(Unit,ModuleName)]</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC174" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--       -- ^ a list of instantiations, where an instantiation is:</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC175" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--            (module hole name, (instantiating unit, instantiating module name))</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC176" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="177" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC177" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A 'Unit' may be indefinite or definite, it depends on whether some holes</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC178" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- remain in the instantiated unit OR in the instantiating units (recursively).</span></span>

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<pre style="margin: 0;">-<span id="LC179" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC180" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Pretty-printing UnitId</span></span>

</pre>

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181

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<pre style="margin: 0;">-<span id="LC181" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ----------------------</span></span>

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182

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<pre style="margin: 0;">-<span id="LC182" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="183" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

183

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<pre style="margin: 0;">-<span id="LC183" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- GHC mostly deals with UnitIds which are some opaque strings. We could display</span></span>

</pre>

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184

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<pre style="margin: 0;">-<span id="LC184" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- them when we pretty-print a module origin, a name, etc. But it wouldn't be</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="185" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

185

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<pre style="margin: 0;">-<span id="LC185" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- very friendly to the user because of the hash they usually contain. E.g.</span></span>

</pre>

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186

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<pre style="margin: 0;">-<span id="LC186" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC187" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    foo-4.18.1:thelib-XYZsomeUglyHashABC</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC188" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="189" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC189" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Instead when we want to pretty-print a 'UnitId' we query the database to</span></span>

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190

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<pre style="margin: 0;">-<span id="LC190" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- get the 'UnitInfo' and print something nicer to the user:</span></span>

</pre>

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191

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<pre style="margin: 0;">-<span id="LC191" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC192" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    foo-4.18.1:thelib</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC193" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC194" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We do the same for wired-in units.</span></span>

</pre>

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195

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<pre style="margin: 0;">-<span id="LC195" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="196" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

196

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<pre style="margin: 0;">-<span id="LC196" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Currently (2020-04-06), we don't thread the database into every function that</span></span>

</pre>

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<td class="diff-line-num old old_line" data-linenumber="197" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">

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<pre style="margin: 0;">-<span id="LC197" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- pretty-prints a Name/Module/Unit. Instead querying the database is delayed</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC198" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- until the `SDoc` is transformed into a `Doc` using the database that is</span></span>

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<pre style="margin: 0;">-<span id="LC199" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- active at this point in time. This is an issue because we want to be able to</span></span>

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<pre style="margin: 0;">-<span id="LC200" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unload units from the database and we also want to support several</span></span>

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<pre style="margin: 0;">-<span id="LC201" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- independent databases loaded at the same time (see #14335). The alternatives</span></span>

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<pre style="margin: 0;">-<span id="LC202" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- we have are:</span></span>

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<pre style="margin: 0;">-<span id="LC203" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC204" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    * threading the database into every function that pretty-prints a UnitId</span></span>

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<pre style="margin: 0;">-<span id="LC205" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    for the user (directly or indirectly).</span></span>

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<pre style="margin: 0;">-<span id="LC206" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC207" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    * storing enough info to correctly display a UnitId into the UnitId</span></span>

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<pre style="margin: 0;">-<span id="LC208" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    datatype itself. This is done in the IndefUnitId wrapper (see</span></span>

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<pre style="margin: 0;">-<span id="LC209" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    'UnitPprInfo' datatype) but not for every 'UnitId'. Statically defined</span></span>

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<pre style="margin: 0;">-<span id="LC210" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    'UnitId' for wired-in units would have empty UnitPprInfo so we need to</span></span>

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<pre style="margin: 0;">-<span id="LC211" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    find some places to update them if we want to display wired-in UnitId</span></span>

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<pre style="margin: 0;">-<span id="LC212" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--    correctly. This leads to a solution similar to the first one above.</span></span>

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<pre style="margin: 0;">-<span id="LC213" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

</pre>

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<pre style="margin: 0;">-<span id="LC214" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [VirtUnit to RealUnit improvement]</span></span>

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<pre style="margin: 0;">-<span id="LC215" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

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<pre style="margin: 0;">-<span id="LC216" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC217" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Over the course of instantiating VirtUnits on the fly while typechecking an</span></span>

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<pre style="margin: 0;">-<span id="LC218" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- indefinite library, we may end up with a fully instantiated VirtUnit. I.e.</span></span>

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<pre style="margin: 0;">-<span id="LC219" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- one that could be compiled and installed in the database. During</span></span>

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<pre style="margin: 0;">-<span id="LC220" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- type-checking we generate a virtual UnitId for it, say "abc".</span></span>

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<pre style="margin: 0;">-<span id="LC221" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC222" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Now the question is: do we have a matching installed unit in the database?</span></span>

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<pre style="margin: 0;">-<span id="LC223" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Suppose we have one with UnitId "xyz" (provided by Cabal so we don't know how</span></span>

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<pre style="margin: 0;">-<span id="LC224" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to generate it). The trouble is that if both units end up being used in the</span></span>

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<pre style="margin: 0;">-<span id="LC225" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- same type-checking session, their names won't match (e.g. "abc:M.X" vs</span></span>

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<pre style="margin: 0;">-<span id="LC226" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- "xyz:M.X").</span></span>

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<pre style="margin: 0;">-<span id="LC227" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC228" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- As we want them to match we just replace the virtual unit with the installed</span></span>

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<pre style="margin: 0;">-<span id="LC229" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- one: for some reason this is called "improvement".</span></span>

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<pre style="margin: 0;">-<span id="LC230" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC231" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- There is one last niggle: improvement based on the package database means</span></span>

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<pre style="margin: 0;">-<span id="LC232" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that we might end up developing on a package that is not transitively</span></span>

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<pre style="margin: 0;">-<span id="LC233" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- depended upon by the packages the user specified directly via command line</span></span>

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<pre style="margin: 0;">-<span id="LC234" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- flags.  This could lead to strange and difficult to understand bugs if those</span></span>

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<pre style="margin: 0;">-<span id="LC235" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- instantiations are out of date.  The solution is to only improve a</span></span>

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<pre style="margin: 0;">-<span id="LC236" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- unit id if the new unit id is part of the 'preloadClosure'; i.e., the</span></span>

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<pre style="margin: 0;">-<span id="LC237" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- closure of all the packages which were explicitly specified.</span></span>

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<pre style="margin: 0;">-<span id="LC238" class="line" lang="haskell"></span>

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<pre style="margin: 0;">-<span id="LC239" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Note [Representation of module/name variables]</span></span>

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<pre style="margin: 0;">-<span id="LC240" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

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<pre style="margin: 0;">-<span id="LC241" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- In our ICFP'16, we use <A> to represent module holes, and {A.T} to represent</span></span>

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<pre style="margin: 0;">-<span id="LC242" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- name holes.  This could have been represented by adding some new cases</span></span>

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<pre style="margin: 0;">-<span id="LC243" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to the core data types, but this would have made the existing 'moduleName'</span></span>

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<pre style="margin: 0;">-<span id="LC244" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and 'moduleUnit' partial, which would have required a lot of modifications</span></span>

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<pre style="margin: 0;">-<span id="LC245" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- to existing code.</span></span>

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<pre style="margin: 0;">-<span id="LC246" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC247" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Instead, we use a fake "hole" unit:</span></span>

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<pre style="margin: 0;">-<span id="LC248" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC249" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--      <A>   ===> hole:A</span></span>

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<pre style="margin: 0;">-<span id="LC250" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--      {A.T} ===> hole:A.T</span></span>

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<pre style="margin: 0;">-<span id="LC251" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>

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<pre style="margin: 0;">-<span id="LC252" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This encoding is quite convenient, but it is also a bit dangerous too,</span></span>

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<pre style="margin: 0;">-<span id="LC253" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- because if you have a 'hole:A' you need to know if it's actually a</span></span>

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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'Module' or just a module stored in a 'Name'; these two cases must be</span></span>

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<pre style="margin: 0;">-<span id="LC255" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- treated differently when doing substitutions.  'renameHoleModule'</span></span>

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<pre style="margin: 0;">-<span id="LC256" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- and 'renameHoleUnit' assume they are NOT operating on a</span></span>

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<pre style="margin: 0;">-<span id="LC257" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- 'Name'; 'NameShape' handles name substitutions exclusively.</span></span></pre>

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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [About Units]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Haskell users are used to manipulate Cabal packages. These packages are</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">identified by:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   - a package name :: String</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   - a package version :: Version</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   - (a revision number, when they are registered on Hackage)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Cabal packages may contain several components (libraries, programs,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">testsuites). In GHC we are mostly interested in libraries because those are</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the components that can be depended upon by other components. Components in a</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="38" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">package are identified by their component name. Historically only one library</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">component was allowed per package, hence it didn't need a name. For this</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC40" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">reason, component name may be empty for one library component in each</span></span>

</pre>

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41

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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">package:</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="42" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC42" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   - a component name :: Maybe String</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">UnitId</span></span>

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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">------</span></span>

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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="47" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Cabal libraries can be compiled in various ways (different compiler options</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC48" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">or Cabal flags, different dependencies, etc.), hence using package name,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC49" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">package version and component name isn't enough to identify a built library.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC50" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We use another identifier called UnitId:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC51" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC52" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  package name             \</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  package version          |                       ________</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  component name           | hash of all this ==> | UnitId |</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC55" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  Cabal flags              |                       --------</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC56" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  compiler options         |</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">  dependencies' UnitId     /</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC58" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Fortunately GHC doesn't have to generate these UnitId: they are provided by</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">external build tools (e.g. Cabal) with `-this-unit-id` command-line parameter.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC62" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">UnitIds are important because they are used to generate internal names</span></span>

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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(symbols, etc.).</span></span>

</pre>

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64

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<pre style="margin: 0;">+<span id="LC64" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Wired-in units</span></span>

</pre>

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66

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<pre style="margin: 0;">+<span id="LC66" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--------------</span></span>

</pre>

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67

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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="68" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC68" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Certain libraries (ghc-prim, base, etc.) are known to the compiler and to the</span></span>

</pre>

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69

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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">RTS as they provide some basic primitives.  Hence UnitIds of wired-in libraries</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">are fixed. Instead of letting Cabal chose the UnitId for these libraries, their</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="71" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">.cabal file uses the following stanza to force it to a specific value:</span></span>

</pre>

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72

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<pre style="margin: 0;">+<span id="LC72" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   ghc-options: -this-unit-id ghc-prim    -- taken from ghc-prim.cabal</span></span>

</pre>

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74

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<pre style="margin: 0;">+<span id="LC74" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="75" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The RTS also uses entities of wired-in units by directly referring to symbols</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">such as "base_GHCziIOziException_heapOverflow_closure" where the prefix is</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the UnitId of "base" unit.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC78" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="79" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC79" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Unit databases</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC80" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">--------------</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC81" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="82" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC82" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Units are stored in databases in order to be reused by other codes:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC83" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC84" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   UnitKey ---> UnitInfo { exposed modules, package name, package version</span></span>

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<pre style="margin: 0;">+<span id="LC85" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                           component name, various file paths,</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC86" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                           dependencies :: [UnitKey], etc. }</span></span>

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<pre style="margin: 0;">+<span id="LC87" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC88" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Because of the wired-in units described above, we can't exactly use UnitIds</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC89" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">as UnitKeys in the database: if we did this, we could only have a single unit</span></span>

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<pre style="margin: 0;">+<span id="LC90" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(compiled library) in the database for each wired-in library. As we want to</span></span>

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<pre style="margin: 0;">+<span id="LC91" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">support databases containing several different units for the same wired-in</span></span>

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<pre style="margin: 0;">+<span id="LC92" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">library, we do this:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC93" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC94" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   * for non wired-in units:</span></span>

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<pre style="margin: 0;">+<span id="LC95" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      * UnitId = UnitKey = Identifier (hash) computed by Cabal</span></span>

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<pre style="margin: 0;">+<span id="LC96" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC97" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   * for wired-in units:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC98" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      * UnitKey = Identifier computed by Cabal (just like for non wired-in units)</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC99" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      * UnitId  = unit-id specified with -this-unit-id command-line flag</span></span>

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<pre style="margin: 0;">+<span id="LC100" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC101" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We can expose several units to GHC via the `package-id <unit-key>` command-line</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC102" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">parameter. We must use the UnitKeys of the units so that GHC can find them in</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC103" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the database.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC104" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC105" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">During unit loading, GHC replaces UnitKeys with UnitIds. It identifies wired</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC106" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">units by their package name (stored in their UnitInfo) and uses wired-in UnitIds</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC107" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">for them.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC108" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC109" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For example, knowing that "base", "ghc-prim" and "rts" are wired-in units, the</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC110" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">following dependency graph expressed with database UnitKeys will be transformed</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC111" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">into a similar graph expressed with UnitIds:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC112" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC113" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   UnitKeys</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC114" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   ~~~~~~~~                      ----------> rts-1.0-hashABC <--</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC115" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                 |                             |</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC116" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                 |                             |</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC117" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   foo-2.0-hash123 --> base-4.1-hashXYZ ---> ghc-prim-0.5.3-hashUVW</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC118" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC119" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   UnitIds</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC120" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   ~~~~~~~               ---------------> rts <--</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC121" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                         |                      |</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC122" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                         |                      |</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC123" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   foo-2.0-hash123 --> base ---------------> ghc-prim</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC124" class="line" lang="haskell"></span>

</pre>

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125

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<pre style="margin: 0;">+<span id="LC125" class="line" lang="haskell"></span>

</pre>

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126

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<pre style="margin: 0;">+<span id="LC126" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that "foo-2.0-hash123" isn't wired-in so its UnitId is the same as its UnitKey.</span></span>

</pre>

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127

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<pre style="margin: 0;">+<span id="LC127" class="line" lang="haskell"></span>

</pre>

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128

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<pre style="margin: 0;">+<span id="LC128" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC129" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Module signatures / indefinite units / instantiated units</span></span>

</pre>

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130

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<pre style="margin: 0;">+<span id="LC130" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">---------------------------------------------------------</span></span>

</pre>

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131

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<pre style="margin: 0;">+<span id="LC131" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC132" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC distinguishes two kinds of units:</span></span>

</pre>

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133

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<pre style="margin: 0;">+<span id="LC133" class="line" lang="haskell"></span>

</pre>

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134

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<pre style="margin: 0;">+<span id="LC134" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   * definite units:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC135" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      * units without module holes and with definite dependencies</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="136" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

136

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<pre style="margin: 0;">+<span id="LC136" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      * can be compiled into machine code (.o/.a/.so/.dll/...)</span></span>

</pre>

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137

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<pre style="margin: 0;">+<span id="LC137" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="138" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

138

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<pre style="margin: 0;">+<span id="LC138" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   * indefinite units:</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="139" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      * units with some module holes or with some indefinite dependencies</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="140" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

140

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<pre style="margin: 0;">+<span id="LC140" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      * can only be type-checked</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="141" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

141

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<pre style="margin: 0;">+<span id="LC141" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="142" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC142" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Module holes are constrained by module signatures (.hsig files). Module</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="143" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

143

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<pre style="margin: 0;">+<span id="LC143" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">signatures are a kind of interface (similar to .hs-boot files). They are used in</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="144" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

144

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<pre style="margin: 0;">+<span id="LC144" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">place of some real code. GHC allows modules from other units to be used to fill</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC145" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">these module holes: the process is called "unit/module instantiation". The</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="146" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC146" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instantiating module may either be a concrete module or a module signature. In</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC147" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the latter case, the signatures are merged to form a new one.</span></span>

</pre>

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148

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<pre style="margin: 0;">+<span id="LC148" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="149" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC149" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">You can think of this as polymorphism at the module level: module signatures</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="150" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC150" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">give constraints on the "type" of module that can be used to fill the hole</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="151" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC151" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(where "type" means types of the exported module entitites, etc.).</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC152" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC153" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Module signatures contain enough information (datatypes, abstract types, type</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="154" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

154

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<pre style="margin: 0;">+<span id="LC154" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">synonyms, classes, etc.) to typecheck modules depending on them but not</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="155" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC155" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">enough to compile them. As such, indefinite units found in databases only</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC156" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">provide module interfaces (the .hi ones this time), not object code.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="157" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC157" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="158" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC158" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To distinguish between indefinite and definite unit ids at the type level, we</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="159" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC159" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">respectively use 'IndefUnitId' and 'DefUnitId' datatypes that are basically</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="160" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC160" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">wrappers over 'UnitId'.</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="161" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC161" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="162" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC162" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Unit instantiation / on-the-fly instantiation</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="163" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC163" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">---------------------------------------------</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="164" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC164" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="165" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC165" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Indefinite units can be instantiated with modules from other units. The</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC166" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instantiating units can also be instantiated themselves (if there are</span></span>

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<pre style="margin: 0;">+<span id="LC167" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">indefinite) and so on.</span></span>

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<pre style="margin: 0;">+<span id="LC168" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC169" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">On-the-fly unit instantiation is a tricky optimization explained in</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC170" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">http://blog.ezyang.com/2016/08/optimizing-incremental-compilation</span></span>

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<pre style="margin: 0;">+<span id="LC171" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Here is a summary:</span></span>

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<pre style="margin: 0;">+<span id="LC172" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC173" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   1. Indefinite units can only be type-checked, not compiled into real code.</span></span>

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<pre style="margin: 0;">+<span id="LC174" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   Type-checking produces interface files (.hi) which are incomplete for code</span></span>

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<pre style="margin: 0;">+<span id="LC175" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   generation (they lack unfoldings, etc.) but enough to perform type-checking</span></span>

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<pre style="margin: 0;">+<span id="LC176" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   of units depending on them.</span></span>

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<pre style="margin: 0;">+<span id="LC177" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC178" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   2. Type-checking an instantiated unit is cheap as we only have to merge</span></span>

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<pre style="margin: 0;">+<span id="LC179" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   interface files (.hi) of the instantiated unit and of the instantiating</span></span>

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<pre style="margin: 0;">+<span id="LC180" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   units, hence it can be done on-the-fly. Interface files of the dependencies</span></span>

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<pre style="margin: 0;">+<span id="LC181" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   can be concrete or produced on-the-fly recursively.</span></span>

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<pre style="margin: 0;">+<span id="LC182" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC183" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   3. When we compile a unit, we mustn't use interfaces produced by the</span></span>

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<pre style="margin: 0;">+<span id="LC184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   type-checker (on-the-fly or not) for the instantiated unit dependencies</span></span>

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<pre style="margin: 0;">+<span id="LC185" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   because they lack some information.</span></span>

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<pre style="margin: 0;">+<span id="LC186" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   4. When we type-check an indefinite unit, we must be consistent about the</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="188" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

188

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<pre style="margin: 0;">+<span id="LC188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   interfaces we use for each dependency: only those produced by the</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="189" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

189

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<pre style="margin: 0;">+<span id="LC189" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   type-checker (on-the-fly or not) or only those produced after a full</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="190" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

190

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<pre style="margin: 0;">+<span id="LC190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   compilation, but not both at the same time.</span></span>

</pre>

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191

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<pre style="margin: 0;">+<span id="LC191" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="192" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC192" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   It can be tricky if we have the following kind of dependency graph:</span></span>

</pre>

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193

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<pre style="margin: 0;">+<span id="LC193" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      X (indefinite) ------> D (definite, compiled) -----> I (instantiated, definite, compiled)</span></span>

</pre>

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195

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<pre style="margin: 0;">+<span id="LC195" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      |----------------------------------------------------^</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC196" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC197" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   Suppose we want to type-check unit X which depends on unit I and D:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC198" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      * I is definite and compiled: we have compiled .hi files for its modules on disk</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="199" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC199" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      * I is instantiated: it is cheap to produce type-checker .hi files for its modules on-the-fly</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC200" class="line" lang="haskell"></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="201" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC201" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   But we must not do:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC202" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC203" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      X (indefinite) ------> D (definite, compiled) -----> I (instantiated, definite, compiled)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="204" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC204" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      |--------------------------------------------------> I (instantiated on-the-fly)</span></span>

</pre>

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<td class="diff-line-num new new_line" data-linenumber="205" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">

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<pre style="margin: 0;">+<span id="LC205" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC206" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      ==> inconsistent module interfaces for I</span></span>

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<pre style="margin: 0;">+<span id="LC207" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC208" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   Nor:</span></span>

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<pre style="margin: 0;">+<span id="LC209" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC210" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      X (indefinite) ------> D (definite, compiled) -------v</span></span>

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<pre style="margin: 0;">+<span id="LC211" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      |--------------------------------------------------> I (instantiated on-the-fly)</span></span>

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<pre style="margin: 0;">+<span id="LC212" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC213" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      ==> D's interfaces may refer to things that only exist in I's *compiled* interfaces</span></span>

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<pre style="margin: 0;">+<span id="LC214" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC215" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   An alternative would be to store both type-checked and compiled interfaces</span></span>

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<pre style="margin: 0;">+<span id="LC216" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   for every compiled non-instantiated unit (instantiated unit can be done</span></span>

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<pre style="margin: 0;">+<span id="LC217" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   on-the-fly) so that we could use type-checked interfaces of D in the</span></span>

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<pre style="margin: 0;">+<span id="LC218" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   example above. But it would increase compilation time and unit size.</span></span>

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<pre style="margin: 0;">+<span id="LC219" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC220" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC221" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The 'Unit' datatype represents a unit which may have been instantiated</span></span>

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<pre style="margin: 0;">+<span id="LC222" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">on-the-fly:</span></span>

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<pre style="margin: 0;">+<span id="LC223" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC224" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   data Unit = RealUnit DefUnitId         -- use compiled interfaces on disk</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC225" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">             | VirtUnit InstantiatedUnit  -- use on-the-fly instantiation</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC226" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC227" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'InstantiatedUnit' has two interesting fields:</span></span>

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<pre style="margin: 0;">+<span id="LC228" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC229" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   * instUnitInstanceOf :: IndefUnitId</span></span>

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<pre style="margin: 0;">+<span id="LC230" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      -- ^ the indefinite unit that is instantiated</span></span>

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<pre style="margin: 0;">+<span id="LC231" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC232" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   * instUnitInsts :: [(ModuleName,(Unit,ModuleName)]</span></span>

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<pre style="margin: 0;">+<span id="LC233" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">      -- ^ a list of instantiations, where an instantiation is:</span></span>

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<pre style="margin: 0;">+<span id="LC234" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">           (module hole name, (instantiating unit, instantiating module name))</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC235" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC236" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">A 'VirtUnit' may be indefinite or definite, it depends on whether some holes</span></span>

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<pre style="margin: 0;">+<span id="LC237" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">remain in the instantiated unit OR in the instantiating units (recursively).</span></span>

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<pre style="margin: 0;">+<span id="LC238" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Having a fully instantiated (i.e. definite) virtual unit can lead to some issues</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC239" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">if there is a matching compiled unit in the preload closure.  See Note [VirtUnit</span></span>

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<pre style="margin: 0;">+<span id="LC240" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to RealUnit improvement]</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC241" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC242" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Unit database and indefinite units</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC243" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">----------------------------------</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC244" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC245" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We don't store partially instantiated units in the unit database.  Units in the</span></span>

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<pre style="margin: 0;">+<span id="LC246" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">database are either:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC247" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC248" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   * definite (fully instantiated or without holes): in this case we have</span></span>

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<pre style="margin: 0;">+<span id="LC249" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     *compiled* module interfaces (.hi) and object codes (.o/.a/.so/.dll/...).</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC250" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC251" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   * fully indefinite (not instantiated at all): in this case we only have</span></span>

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<pre style="margin: 0;">+<span id="LC252" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     *type-checked* module interfaces (.hi).</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC254" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that indefinite units are stored as an instantiation of themselves where</span></span>

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<pre style="margin: 0;">+<span id="LC255" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">each instantiating module is a module variable (see Note [Representation of</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC256" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">module/name variables]). E.g.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC257" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   "xyz" (UnitKey) ---> UnitInfo { instanceOf       = "xyz"</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC259" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                 , instantiatedWith = [A=<A>,B=<B>...]</span></span>

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<pre style="margin: 0;">+<span id="LC260" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                 , ...</span></span>

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<pre style="margin: 0;">+<span id="LC261" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                 }</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC262" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC263" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that non-instantiated units are also stored as an instantiation of</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC264" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">themselves.  It is a reminiscence of previous terminology (when "instanceOf" was</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"componentId"). E.g.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC266" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC267" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   "xyz" (UnitKey) ---> UnitInfo { instanceOf       = "xyz"</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC268" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                 , instantiatedWith = []</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC269" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                 , ...</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC270" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">                                 }</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC271" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC272" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">TODO: We should probably have `instanceOf :: Maybe IndefUnitId` instead.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC273" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC274" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC275" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Pretty-printing UnitId</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">----------------------</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">GHC mostly deals with UnitIds which are some opaque strings. We could display</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">them when we pretty-print a module origin, a name, etc. But it wouldn't be</span></span>

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<pre style="margin: 0;">+<span id="LC280" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">very friendly to the user because of the hash they usually contain. E.g.</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC281" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   foo-4.18.1:thelib-XYZsomeUglyHashABC</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC283" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC284" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Instead when we want to pretty-print a 'UnitId' we query the database to</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC285" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">get the 'UnitInfo' and print something nicer to the user:</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC286" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC287" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   foo-4.18.1:thelib</span></span>

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<pre style="margin: 0;">+<span id="LC288" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC289" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We do the same for wired-in units.</span></span>

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<pre style="margin: 0;">+<span id="LC290" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC291" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Currently (2020-04-06), we don't thread the database into every function that</span></span>

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<pre style="margin: 0;">+<span id="LC292" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">pretty-prints a Name/Module/Unit. Instead querying the database is delayed</span></span>

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<pre style="margin: 0;">+<span id="LC293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">until the `SDoc` is transformed into a `Doc` using the database that is</span></span>

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<pre style="margin: 0;">+<span id="LC294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">active at this point in time. This is an issue because we want to be able to</span></span>

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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unload units from the database and we also want to support several</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">independent databases loaded at the same time (see #14335). The alternatives</span></span>

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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">we have are:</span></span>

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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   * threading the database into every function that pretty-prints a UnitId</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC300" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   for the user (directly or indirectly).</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC301" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   * storing enough info to correctly display a UnitId into the UnitId</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   datatype itself. This is done in the IndefUnitId wrapper (see</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   'UnitPprInfo' datatype) but not for every 'UnitId'. Statically defined</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC305" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   'UnitId' for wired-in units would have empty UnitPprInfo so we need to</span></span>

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<pre style="margin: 0;">+<span id="LC306" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   find some places to update them if we want to display wired-in UnitId</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">   correctly. This leads to a solution similar to the first one above.</span></span>

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<pre style="margin: 0;">+<span id="LC308" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC309" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [VirtUnit to RealUnit improvement]</span></span>

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<pre style="margin: 0;">+<span id="LC310" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC311" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC312" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Over the course of instantiating VirtUnits on the fly while typechecking an</span></span>

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<pre style="margin: 0;">+<span id="LC313" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">indefinite library, we may end up with a fully instantiated VirtUnit. I.e.</span></span>

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<pre style="margin: 0;">+<span id="LC314" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">one that could be compiled and installed in the database. During</span></span>

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<pre style="margin: 0;">+<span id="LC315" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">type-checking we generate a virtual UnitId for it, say "abc".</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC316" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC317" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Now the question is: do we have a matching installed unit in the database?</span></span>

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<pre style="margin: 0;">+<span id="LC318" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we have one with UnitId "xyz" (provided by Cabal so we don't know how</span></span>

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<pre style="margin: 0;">+<span id="LC319" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to generate it). The trouble is that if both units end up being used in the</span></span>

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<pre style="margin: 0;">+<span id="LC320" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">same type-checking session, their names won't match (e.g. "abc:M.X" vs</span></span>

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<pre style="margin: 0;">+<span id="LC321" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">"xyz:M.X").</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC322" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC323" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">As we want them to match we just replace the virtual unit with the installed</span></span>

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<pre style="margin: 0;">+<span id="LC324" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">one: for some reason this is called "improvement".</span></span>

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<pre style="margin: 0;">+<span id="LC325" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC326" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is one last niggle: improvement based on the unit database means</span></span>

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<pre style="margin: 0;">+<span id="LC327" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">that we might end up developing on a unit that is not transitively</span></span>

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<pre style="margin: 0;">+<span id="LC328" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">depended upon by the units the user specified directly via command line</span></span>

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<pre style="margin: 0;">+<span id="LC329" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">flags.  This could lead to strange and difficult to understand bugs if those</span></span>

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<pre style="margin: 0;">+<span id="LC330" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instantiations are out of date.  The solution is to only improve a</span></span>

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<pre style="margin: 0;">+<span id="LC331" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">unit id if the new unit id is part of the 'preloadClosure'; i.e., the</span></span>

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<pre style="margin: 0;">+<span id="LC332" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">closure of all the units which were explicitly specified.</span></span>

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<pre style="margin: 0;">+<span id="LC333" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC334" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Representation of module/name variables]</span></span>

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<pre style="margin: 0;">+<span id="LC335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>

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<pre style="margin: 0;">+<span id="LC336" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">In our ICFP'16, we use <A> to represent module holes, and {A.T} to represent</span></span>

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<pre style="margin: 0;">+<span id="LC337" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">name holes.  This could have been represented by adding some new cases</span></span>

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<pre style="margin: 0;">+<span id="LC338" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to the core data types, but this would have made the existing 'moduleName'</span></span>

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<pre style="margin: 0;">+<span id="LC339" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and 'moduleUnit' partial, which would have required a lot of modifications</span></span>

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<pre style="margin: 0;">+<span id="LC340" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to existing code.</span></span>

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<pre style="margin: 0;">+<span id="LC341" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC342" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Instead, we use a fake "hole" unit:</span></span>

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<pre style="margin: 0;">+<span id="LC343" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC344" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     <A>   ===> hole:A</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC345" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">     {A.T} ===> hole:A.T</span></span>

</pre>

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<pre style="margin: 0;">+<span id="LC346" class="line" lang="haskell"></span>

</pre>

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<pre style="margin: 0;">+<span id="LC347" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">This encoding is quite convenient, but it is also a bit dangerous too,</span></span>

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<pre style="margin: 0;">+<span id="LC348" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">because if you have a 'hole:A' you need to know if it's actually a</span></span>

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<pre style="margin: 0;">+<span id="LC349" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'Module' or just a module stored in a 'Name'; these two cases must be</span></span>

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<pre style="margin: 0;">+<span id="LC350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">treated differently when doing substitutions.  'renameHoleModule'</span></span>

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<pre style="margin: 0;">+<span id="LC351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and 'renameHoleUnit' assume they are NOT operating on a</span></span>

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<pre style="margin: 0;">+<span id="LC352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">'Name'; 'NameShape' handles name substitutions exclusively.</span></span>

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<pre style="margin: 0;">+<span id="LC353" class="line" lang="haskell"></span>

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<pre style="margin: 0;">+<span id="LC354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>

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