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<h3>
Ben Gamari pushed to branch wip/T17609
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0fbfc7582fb81314dc28a056536737fb5eeaa6e">b0fbfc75</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-24T12:07:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Switch order on `GhcMake.IsBoot`
In !1798 we were requested to replace many `Bool`s with this data type.
But those bools had `False` meaning `NotBoot`, so the `Ord` instance
would be flipped if we use this data-type as-is.
Since the planned formally-`Bool` occurrences vastly outnumber the
current occurrences, we figured it would be better to conform the `Ord`
instance to how the `Bool` is used now, fixing any issues, rather than
fix them currently with the bigger refactor later in !1798. That way,
!1798 can be a "pure" refactor with no behavioral changes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af332442123878c1b61d236dce46418efcbe8750">af332442</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-26T13:55:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Modules: Utils and Data (#13009)
Update Haddock submodule
Metric Increase:
haddock.compiler
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cd4434c8e77213bf3e6f83227fd8802c9f2a6fe2">cd4434c8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-26T13:55:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix misleading Ptr phantom type in SerializedCompact (#15653)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/22bf5c738e0339fa12940414d6448896c6733808">22bf5c73</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-26T13:55:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Tweak includes in non-moving GC headers
We don't use hash tables in non-moving GC so remove the includes.
This breaks Compact.c as existing includes no longer include Hash.h, so
include Hash.h explicitly in Compact.c.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99823ed24b22447b14202ca57f75550773c44dbe">99823ed2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-27T20:24:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">TH: fix Show/Eq/Ord instances for Bytes (#16457)
We shouldn't compare pointer values but the actual bytes.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c62271a21b1ba1d207aaebf370c87dd884fa6ae1">c62271a2</a></strong>
<div>
<span>by Alp Mestanogullari</span>
<i>at 2020-04-27T20:25:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: always capture both stdout and stderr when running a builder fails
The idea being that when a builder('s command) fails, we quite likely want to
have all the information available to figure out why. Depending on the builder
_and_ the particular problem, the useful bits of information can be printed
on stdout or stderr.
We accomplish this by defining a simple wrapper for Shake's `cmd` function,
that just _always_ captures both streams in case the command returns a non-zero
exit code, and by using this wrapper everywhere in `hadrian/src/Builder.hs`.
Fixes #18089.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4b9764db7c190de377c06dfc71bfe6e4b37c7eb0">4b9764db</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-28T15:40:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Define a Quote IO instance
Fixes #18103.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/518a63d4d7e31e49a81ad66d5e5ccb1f790f6de9">518a63d4</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-28T15:40:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make boxed 1-tuples have known keys
Unlike other tuples, which use special syntax and are "known" by way
of a special `isBuiltInOcc_maybe` code path, boxed 1-tuples do not
use special syntax. Therefore, in order to make sure that the
internals of GHC are aware of the `data Unit a = Unit a` definition
in `GHC.Tuple`, we give `Unit` known keys. For the full details, see
`Note [One-tuples] (Wrinkle: Make boxed one-tuple names have known keys)`
in `GHC.Builtin.Types`.
Fixes #18097.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2cfc4ab9710c873a55e9a44aac9dacb06ecce36f">2cfc4ab9</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document backpack fields in DynFlags
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10a2ba90aa6a788677104cc43318c66f46e2e2b0">10a2ba90</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor UnitInfo
* Rename InstalledPackageInfo into GenericUnitInfo
The name InstalledPackageInfo is only kept for alleged backward
compatibility reason in Cabal. ghc-boot has its own stripped down copy
of this datatype but it doesn't need to keep the name. Internally we
already use type aliases (UnitInfo in GHC, PackageCacheFormat in
ghc-pkg).
* Rename UnitInfo fields: add "unit" prefix and fix misleading names
* Add comments on every UnitInfo field
* Rename SourcePackageId into PackageId
"Package" already indicates that it's a "source package". Installed
package components are called units.
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/69562e34fb5d9571e9efc1cb90c879e50129a510">69562e34</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused `emptyGenericUnitInfo`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9e2c8e0e37a2709d5790d6c9a877a1463d6e88b5">9e2c8e0e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor UnitInfo load/store from databases
Converting between UnitInfo stored in package databases and UnitInfo as
they are used in ghc-pkg and ghc was done in a very convoluted way (via
BinaryStringRep and DbUnitModuleRep type classes using fun deps, etc.).
It was difficult to understand and even more to modify (I wanted to
try to use a GADT for UnitId but fun deps got in the way).
The new code uses much more straightforward functions to convert between
the different representations. Much simpler.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea717aa4248b2122e1f7550f30239b50ab560e4f">ea717aa4</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Factorize mungePackagePaths code
This patch factorizes the duplicated code used in ghc-pkg and in GHC to
munge package paths/urls.
It also fixes haddock-html munging in GHC (allowed to be either a file
or a url) to mimic ghc-pkg behavior.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/10d15f1ec4bab4dd6152d87fc66e61658a705eb3">10d15f1e</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring unit management code
Over the years the unit management code has been modified a lot to keep
up with changes in Cabal (e.g. support for several library components in
the same package), to integrate BackPack, etc. I found it very hard to
understand as the terminology wasn't consistent, was referring to past
concepts, etc.
The terminology is now explained as clearly as I could in the Note
"About Units" and the code is refactored to reflect it.
-------------------
Many names were misleading: UnitId is not an Id but could be a virtual
unit (an indefinite one instantiated on the fly), IndefUnitId
constructor may contain a definite instantiated unit, etc.
* Rename IndefUnitId into InstantiatedUnit
* Rename IndefModule into InstantiatedModule
* Rename UnitId type into Unit
* Rename IndefiniteUnitId constructor into VirtUnit
* Rename DefiniteUnitId constructor into RealUnit
* Rename packageConfigId into mkUnit
* Rename getPackageDetails into unsafeGetUnitInfo
* Rename InstalledUnitId into UnitId
Remove references to misleading ComponentId: a ComponentId is just an
indefinite unit-id to be instantiated.
* Rename ComponentId into IndefUnitId
* Rename ComponentDetails into UnitPprInfo
* Fix display of UnitPprInfo with empty version: this is now used for
units dynamically generated by BackPack
Generalize several types (Module, Unit, etc.) so that they can be used
with different unit identifier types: UnitKey, UnitId, Unit, etc.
* GenModule: Module, InstantiatedModule and InstalledModule are now
instances of this type
* Generalize DefUnitId, IndefUnitId, Unit, InstantiatedUnit,
PackageDatabase
Replace BackPack fake "hole" UnitId by a proper HoleUnit constructor.
Add basic support for UnitKey. They should be used more in the future to
avoid mixing them up with UnitId as we do now.
Add many comments.
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8bfb0219587b969d5c8f723c46d433e9493958b4">8bfb0219</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-30T01:56:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Unit: split and rename modules
Introduce GHC.Unit.* hierarchy for everything concerning units, packages
and modules.
Update Haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/71484b09fa3c676e99785b3d68f69d4cfb14266e">71484b09</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-30T01:57:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow block arguments in arrow control operators
Arrow control operators have their own entries in the grammar, so they
did not cooperate with BlockArguments. This was just a minor oversight,
so this patch adjusts the grammar to add the desired behavior.
fixes #18050
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a48cd2a045695c5f34ed7b00184a8d91c4fcac0e">a48cd2a0</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-30T01:57:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow LambdaCase to be used as a command in proc notation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f4d3773c7f4209cd3a0495ab9a29b978da48e2ff">f4d3773c</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-04-30T01:57:35-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document BlockArguments/LambdaCase support in arrow notation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5bdfdd139e5aff57631e9f1c6654dc7b8590c63f">5bdfdd13</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-30T01:58:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tests for #17873
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/19b701c216246596710f0eba112ed5ee7b6bf870">19b701c2</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-30T07:30:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Mark rule args as non-tail-called
This was just an omission...b I'd failed to call markAllNonTailCall on
rule args. I think this bug has been here a long time, but it's quite
hard to trigger.
Fixes #18098
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/014ef4a3d9ee30b8add9118950f1f5007143bd1c">014ef4a3</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-04-30T07:30:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: Improve tool-args command to support more components
There is a new command to hadrian, tool:path/to/file.hs, which returns
the options needed to compile that file in GHCi.
This is now used in the ghci script with argument `ghc/Main.hs` but its
main purpose is to support the new multi-component branch of ghcide.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2aa676114bca40d6124ba90d13242c7c102369e0">2aa67611</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-30T21:34:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Clear bitmap after initializing block size
Previously nonmovingInitSegment would clear the bitmap before
initializing the segment's block size. This is broken since
nonmovingClearBitmap looks at the segment's block size to determine how
much bitmap to clear.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/54dad3cf1e04f16ea00fb6a41b378e948c8ebf0f">54dad3cf</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-30T21:34:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Explicitly memoize block count
A profile cast doubt on whether the compiler hoisted the bound out the
loop as I would have expected here. It turns out it did but nevertheless
it seems clearer to just do this manually.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/99ff8145044288a8a58c8028516903937ba3935c">99ff8145</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-30T21:34:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Eagerly flush all capabilities' update remembered sets
(cherry picked from commit 2fa79119570b358a4db61446396889b8260d7957)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05b0a9fd136869f71245e12fdae64d42dc2ee1df">05b0a9fd</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-30T21:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove OneShotInfo field of LFReEntrant, document OneShotInfo
The field is only used in withNewTickyCounterFun and it's easier to
directly pass a parameter for one-shot info to withNewTickyCounterFun
instead of passing it via LFReEntrant. This also makes !2842 simpler.
Other changes:
- New Note (by SPJ) [OneShotInfo overview] added.
- Arity argument of thunkCode removed as it's always 0.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a43620c621563deed76ba6b417e3a7a707c15d23">a43620c6</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-30T21:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.StgToCmm.Ticky: remove a few unused stuff
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/780de9e11014a88a4f676eb296c30fec2b07b5c2">780de9e1</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-01T10:37:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use platform in Iface Binary
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f8386c7b6a9d26bc5fd2c1d74d944c8df6337690">f8386c7b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-01T10:37:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor PprDebug handling
If `-dppr-debug` is set, then PprUser and PprDump styles are silently
replaced with PprDebug style. This was done in `mkUserStyle` and
`mkDumpStyle` smart constructors. As a consequence they needed a
DynFlags parameter.
Now we keep the original PprUser and PprDump styles until they are used
to create an `SDocContext`. I.e. the substitution is only performed in
`initSDocContext`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3df9e780fb2f5658412c644849cd0f1e6f50331">b3df9e78</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-01T10:37:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove PprStyle param of logging actions
Use `withPprStyle` instead to apply a specific style to a SDoc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/de9fc995c2170bc34600ee3fc80393c67cfecad1">de9fc995</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-01T10:37:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fully remove PprDebug
PprDebug was a pain to deal with consistently as it is implied by
`-dppr-debug` but it isn't really a PprStyle. We remove it completely
and query the appropriate SDoc flag instead (`sdocPprDebug`) via
helpers (`getPprDebug` and its friends).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8b51fcbd67ca17a6dcc2f9e5a29176f836bf11d2">8b51fcbd</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-01T10:38:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Only call checkSingle if we would report warnings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fd7ea0fee92a60f9658254cc4fe3abdb4ff299b1">fd7ea0fe</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-05-01T10:38:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Pick up `EvVar`s bound in `HsWrapper`s for long-distance info
`HsWrapper`s introduce evidence bindings through `WpEvLam` which the
pattern-match coverage checker should be made aware of.
Failing to do so caused #18049, where the resulting impreciseness of
imcompleteness warnings seemingly contradicted with
`-Winaccessible-code`.
The solution is simple: Collect all the evidence binders of an
`HsWrapper` and add it to the ambient `Deltas` before desugaring
the wrapped expression.
But that means we pick up many more evidence bindings, even when they
wrap around code without a single pattern match to check! That regressed
`T3064` by over 300%, so now we are adding long-distance info lazily
through judicious use of `unsafeInterleaveIO`.
Fixes #18049.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7bfe9ac514e18c0b0e24ff55230fe98ec9db894c">7bfe9ac5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-03T04:41:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Enable tracing of nonmoving heap census with -ln
Previously this was not easily available to the user. Fix this.
Non-moving collection lifecycle events are now reported with -lg.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c560dd07f506810eaabae2f582491138aa224819">c560dd07</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-03T04:41:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Move eventlog documentation users guide
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/02543d5ef9bd7a910fc9fece895780583ab9635a">02543d5e</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-03T04:41:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Add documentation for non-moving GC events
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b465dd4500beffe919e8b8dcd075008399fbf446">b465dd45</a></strong>
<div>
<span>by Alexis King</span>
<i>at 2020-05-03T04:42:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Flatten nested casts in the simple optimizer
Normally, we aren’t supposed to generated any nested casts, since mkCast
takes care to flatten them, but the simple optimizer didn’t use mkCast,
so they could show up after inlining. This isn’t really a problem, since
the simplifier will clean them up immediately anyway, but it can clutter
the -ddump-ds output, and it’s an extremely easy fix.
closes #18112
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8bdc03d61cb7a2f96887c86bd0b253f7c108fcde">8bdc03d6</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-05-04T01:56:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't return a panic in tcNestedSplice
In GHC.Tc.Gen.Splice.tcNestedSplice we were returning a
typechecked expression of "panic". That is usually OK, because
the result is discarded. But it happens that tcApp now looks at
the typechecked expression, trivially, to ask if it is tagToEnum.
So being bottom is bad.
Moreover a debug-trace might print it out.
So better to return a civilised expression, even though it is
usually discarded.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0bf640b19d7a7ad0800152752a71c1dd4e6c696d">0bf640b1</a></strong>
<div>
<span>by Baldur Blöndal</span>
<i>at 2020-05-04T01:57:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't require parentheses around via type (`-XDerivingVia'). Fixes #18130".
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/30272412fa437ab8e7a8035db94a278e10513413">30272412</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-05-04T13:19:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove custom ExceptionMonad class (#18075) (updating haddock submodule accordingly)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b9f7c08ff5aa71b7673c8136b897e6f29de01330">b9f7c08f</a></strong>
<div>
<span>by jneira</span>
<i>at 2020-05-04T13:20:37-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused hs-boot file
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1d8f80cd64edd1ea6a5d4c4aa2e09ad0d077ae1b">1d8f80cd</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-05T03:22:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove references to -package-key
* remove references to `-package-key` which has been removed in 2016
(240ddd7c39536776e955e881d709bbb039b48513)
* remove support for `-this-package-key` which has been deprecated at the
same time
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7bc3a65b467c4286377b9bded277d5a2f69160b3">7bc3a65b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-05T03:23:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove SpecConstrAnnotation (#13681)
This has been deprecated since 2013. Use GHC.Types.SPEC instead.
Make GHC.Exts "not-home" for haddock
Metric Decrease:
haddock.base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3c862f635394b02c121f917a4d9ea7802033eebb">3c862f63</a></strong>
<div>
<span>by DenisFrezzato</span>
<i>at 2020-05-05T03:24:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix Haskell98 short description in documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2420c555e6cb681f4ef7c4ae3192a850ab431759">2420c555</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-05T03:24:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression tests for #16244, #16245, #16758
Commit e3c374cc5bd7eb49649b9f507f9f7740697e3f70 ended up
fixing quite a few bugs:
* This commit fixes #16244 completely. A regression test has been
added.
* This commit fixes one program from #16245. (The program in
https://gitlab.haskell.org/ghc/ghc/issues/16245#note_211369 still
panics, and the program in
https://gitlab.haskell.org/ghc/ghc/issues/16245#note_211400 still
loops infinitely.) A regression test has been added for this
program.
* This commit fixes #16758. Accordingly, this patch removes the
`expect_broken` label from the `T16758` test case, moves it from
`should_compile` to `should_fail` (as it should produce an error
message), and checks in the expected stderr.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/40c71c2cf38b4e134d81b7184a4d5e02949ae70c">40c71c2c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-05T03:25:31-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix colorized error messages (#18128)
In b3df9e780fb2f5658412c644849cd0f1e6f50331 I broke colorized messages
by using "dump" style instead of "user" style. This commits fixes it.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ab6ab093c86227b6d33a5185ebbd11928ac9754">7ab6ab09</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-05-06T04:39:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactor hole constraints.
Previously, holes (both expression holes / out of scope variables and
partial-type-signature wildcards) were emitted as *constraints* via
the CHoleCan constructor. While this worked fine for error reporting,
there was a fair amount of faff in keeping these constraints in line.
In particular, and unlike other constraints, we could never change
a CHoleCan to become CNonCanonical. In addition:
* the "predicate" of a CHoleCan constraint was really the type
of the hole, which is not a predicate at all
* type-level holes (partial type signature wildcards) carried
evidence, which was never used
* tcNormalise (used in the pattern-match checker) had to create
a hole constraint just to extract it again; it was quite messy
The new approach is to record holes directly in WantedConstraints.
It flows much more nicely now.
Along the way, I did some cleaning up of commentary in
GHC.Tc.Errors.Hole, which I had a hard time understanding.
This was instigated by a future patch that will refactor
the way predicates are handled. The fact that CHoleCan's
"predicate" wasn't really a predicate is incompatible with
that future patch.
No test case, because this is meant to be purely internal.
It turns out that this change improves the performance of
the pattern-match checker, likely because fewer constraints
are sloshing about in tcNormalise. I have not investigated
deeply, but an improvement is not a surprise here:
-------------------------
Metric Decrease:
PmSeriesG
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/420b957df9d831632a3edab682778b11734255f1">420b957d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-06T04:40:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Zero block flags with -DZ
Block flags are very useful for determining the state of a block.
However, some block allocator users don't touch them, leading to
misleading values. Ensure that we zero then when zero-on-gc is set. This
is safe and makes the flags more useful during debugging.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/740b3b8df76dabd88bdb3474aad2b287b0960f07">740b3b8d</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-06T04:40:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix incorrect failed_to_evac value during deadlock gc
Previously we would incorrectly set the failed_to_evac flag if we
evacuated a value due to a deadlock GC. This would cause us to mark more
things as dirty than strictly necessary. It also turned up a nasty but
which I will fix next.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b2d72c758233830446230800d0045badc01b42ca">b2d72c75</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-06T04:40:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nonmoving: Fix handling of dirty objects
Previously we (incorrectly) relied on failed_to_evac to be "precise".
That is, we expected it to only be true if *all* of an object's fields
lived outside of the non-moving heap. However, does not match the
behavior of failed_to_evac, which is true if *any* of the object's
fields weren't promoted (meaning that some others *may* live in the
non-moving heap).
This is problematic as we skip the non-moving write barrier for dirty
objects (which we can only safely do if *all* fields point outside of
the non-moving heap).
Clearly this arises due to a fundamental difference in the behavior
expected of failed_to_evac in the moving and non-moving collector.
e.g., in the moving collector it is always safe to conservatively say
failed_to_evac=true whereas in the non-moving collector the safe value
is false.
This issue went unnoticed as I never wrote down the dirtiness
invariant enforced by the non-moving collector. We now define this
invariant as
An object being marked as dirty implies that all of its fields are
on the mark queue (or, equivalently, update remembered set).
To maintain this invariant we teach nonmovingScavengeOne to push the
fields of objects which we fail to evacuate to the update remembered
set. This is a simple and reasonably cheap solution and avoids the
complexity and fragility that other, more strict alternative invariants
would require.
All of this is described in a new Note, Note [Dirty flags in the
non-moving collector] in NonMoving.c.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9f3e6884e338015f2953c4c0844e04d467f53dd5">9f3e6884</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-05-06T04:41:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow atomic update of NameCache in readHieFile
The situation arises in ghcide where multiple different threads may need to
update the name cache, therefore with the older interface it could happen
that you start reading a hie file with name cache A and produce name cache
A + B, but another thread in the meantime updated the namecache to A +
C. Therefore if you write the new namecache you will lose the A' updates
from the second thread.
Updates haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/edec6a6c205378caf15d1d874d7e901ba76dd293">edec6a6c</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-06T04:41:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make isTauTy detect higher-rank contexts
Previously, `isTauTy` would only detect higher-rank `forall`s, not
higher-rank contexts, which led to some minor bugs observed
in #18127. Easily fixed by adding a case for
`(FunTy InvisArg _ _)`.
Fixes #18127.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a95e7fe02efd2fdeec91ba46de64bc78c81381eb">a95e7fe0</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-05-06T04:42:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ELF linker: increment curSymbol after filling in fields of current entry
The bug was introduced in a8b7cef4d45 which added a field to the
`symbols` array elements and then updated this code incorrectly:
- oc->symbols[curSymbol++] = nm;
+ oc->symbols[curSymbol++].name = nm;
+ oc->symbols[curSymbol].addr = symbol->addr;
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cab1871ab93feeacf2bf9a1c65b1c919ca9c5399">cab1871a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-06T04:43:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move LeadingUnderscore into Platform (#17957)
Avoid direct use of DynFlags to know if symbols must be prefixed by an
underscore.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/94e7c563ab24fe452a16900a6777349970df1945">94e7c563</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-05-06T04:43:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't use DynFlags in showLinkerState (#17957)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9afd92512b41cf6c6de3a17b474d8d4bb01158c3">9afd9251</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-06T04:43:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Refactoring: Use bindSigTyVarsFV in rnMethodBinds
`rnMethodBinds` was explicitly using `xoptM` to determine if
`ScopedTypeVariables` is enabled before bringing type variables
bound by the class/instance header into scope. However, this `xoptM`
logic is already performed by the `bindSigTyVarsFV` function. This
patch uses `bindSigTyVarsFV` in `rnMethodBinds` to reduce the number
of places where we need to consult if `ScopedTypeVariables` is on.
This is purely refactoring, and there should be no user-visible
change in behavior.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6f6d72b2c382860a5f7a08779b2405da8473814c">6f6d72b2</a></strong>
<div>
<span>by Brian Foley</span>
<i>at 2020-05-08T15:29:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove further dead code found by a simple Python script.
Avoid removing some functions that are part of an API even
though they're not used in-tree at the moment.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/78bf8bf967551f8667b766328504cfbd24df9bfb">78bf8bf9</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-05-08T15:29:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add doc examples for Bifoldable
See #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/66f0a847255f15ec656a37d639556b7918f6aac2">66f0a847</a></strong>
<div>
<span>by Julien Debon</span>
<i>at 2020-05-08T15:29:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">doc (Bitraversable): Add examples to Bitraversable
* Add examples to Data.Bitraversable
* Fix formatting for (,) in Bitraversable and Bifoldable
* Fix mistake on bimapAccumR documentation
See #17929
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9749fe1223d182b1f8e7e4f7378df661c509f396">9749fe12</a></strong>
<div>
<span>by Baldur Blöndal</span>
<i>at 2020-05-08T15:29:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Specify kind variables for inferred kinds in base.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4e9aef9ea732e8157ee0b7fbb85b2cdfbf49de5f">4e9aef9e</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-08T15:29:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">HsSigWcTypeScoping: Pull in documentation from stray location
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f4d5c6df56a28be5448acf43e4f45b1695ae9eb5">f4d5c6df</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-08T15:29:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename local `real_fvs` to `implicit_vs`
It doesn't make sense to call the "free" variables we are about to
implicitly bind the real ones.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/20570b4b5e741912d1dc3f1826ee1f78e33f3b90">20570b4b</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-08T15:29:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">A few tiny style nits with renaming
- Use case rather than guards that repeatedly scrutenize same thing.
- No need for view pattern when `L` is fine.
- Use type synnonym to convey the intent like elsewhere.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/09ac8de5777d5ca953279a6c0ee42a6fba0fcba6">09ac8de5</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-05-08T15:29:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add `forAllOrNothing` function with note
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bb35c0e573b0bc8fe6a28c00734fa124da02a755">bb35c0e5</a></strong>
<div>
<span>by Joseph C. Sible</span>
<i>at 2020-05-08T15:29:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document lawlessness of Ap's Num instance</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cdd229fff24ab19a41dd2af218108dd8c514fff7">cdd229ff</a></strong>
<div>
<span>by Joseph C. Sible</span>
<i>at 2020-05-08T15:29:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply suggestion to libraries/base/Data/Monoid.hs</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/926d2aab83dc6068cba76f71a19b040eddc6dee9">926d2aab</a></strong>
<div>
<span>by Joseph C. Sible</span>
<i>at 2020-05-08T15:29:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Apply more suggestions from Simon Jakobi</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7a763cff78d2d4b23d05554e68138678cb4ba627">7a763cff</a></strong>
<div>
<span>by Adam Gundry</span>
<i>at 2020-05-08T15:29:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reject all duplicate declarations involving DuplicateRecordFields (fixes #17965)
This fixes a bug that resulted in some programs being accepted that used the same
identifier as a field label and another declaration, depending on the order they
appeared in the source code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/88e3c8150d2b2d96c3ebc0b2942c9af44071c511">88e3c815</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-05-08T15:29:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix specialisation for DFuns
When specialising a DFun we must take care to saturate the
unfolding. See Note [Specialising DFuns] in Specialise.
Fixes #18120
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/86c77b36628dcce7bc9b066fc24c8c521fecc3ee">86c77b36</a></strong>
<div>
<span>by Greg Steuck</span>
<i>at 2020-05-08T15:29:45-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove unused SEGMENT_PROT_RWX
It's been unused for a year and is problematic on any OS which
requires W^X for security.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9d97f4b5ddcfdf32b52734188f595d9a11fd4879">9d97f4b5</a></strong>
<div>
<span>by nineonine</span>
<i>at 2020-05-08T15:30:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #16167
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/aa318338b753ab6e9db44cf2c2d285827eb35a03">aa318338</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-05-08T15:30:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump exceptions submodule so that dist-boot is .gitignore'd
`exceptions` is a stage-0 boot library as of commit
30272412fa437ab8e7a8035db94a278e10513413, which means that building
`exceptions` in a GHC tree will generate a `dist-boot` directory.
However, this directory was not specified in `exceptions`'
`.gitignore` file, which causes it to dirty up the current `git`
working directory.
Accordingly, this bumps the `exceptions` submodule to commit
ghc/packages/exceptions@23c0b8a50d7592af37ca09beeec16b93080df98f,
which adds `dist-boot` to the `.gitignore` file.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ea86360f21e8c9812acba8dc1bc2a54fef700ece">ea86360f</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-05-08T15:30:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Linker.c: initialize n_symbols of ObjectCode with other fields
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/17d5cd579a2c2958e5ecba7311ed6030923127ef">17d5cd57</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-05-09T21:48:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">nativeGen: Deduplicate DWARF strings
As noted in #17609, we previously made no attempt to deduplicate
strings. This resulted in unnecessarily long compile times and large
object files. Fix this.
Fixes #17609.
</pre>
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compiler/GHC.hs
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compiler/GHC/Builtin/Names.hs
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compiler/GHC/Builtin/Names.hs-boot
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compiler/GHC/Builtin/Names/TH.hs
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compiler/GHC/Builtin/PrimOps.hs
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compiler/GHC/Builtin/PrimOps.hs-boot
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compiler/GHC/Builtin/Types.hs
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compiler/GHC/Builtin/Types/Literals.hs
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compiler/GHC/Builtin/Types/Prim.hs
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compiler/GHC/Builtin/Uniques.hs
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compiler/GHC/Builtin/Uniques.hs-boot
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compiler/GHC/ByteCode/Asm.hs
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compiler/GHC/ByteCode/InfoTable.hs
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compiler/GHC/ByteCode/Instr.hs
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compiler/GHC/ByteCode/Linker.hs
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compiler/GHC/ByteCode/Types.hs
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compiler/GHC/Cmm.hs
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compiler/GHC/Cmm/BlockId.hs
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compiler/GHC/Cmm/CLabel.hs
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compiler/GHC/Cmm/CallConv.hs
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compiler/GHC/Cmm/CommonBlockElim.hs
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compiler/GHC/Cmm/Dataflow.hs
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compiler/GHC/Cmm/Dataflow/Block.hs
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compiler/GHC/Cmm/Dataflow/Collections.hs
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compiler/GHC/Cmm/Dataflow/Graph.hs
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compiler/GHC/Cmm/Dataflow/Label.hs
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compiler/GHC/Cmm/DebugBlock.hs
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compiler/GHC/Cmm/Expr.hs
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