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<h3>
Ben Gamari pushed to branch master
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/30caeee75193ea961c55ee847a3156e23116e84e">30caeee7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-07-21T06:39:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: remove use of sdocWithDynFlags from GHC.Stg.* (#17957)
* add StgPprOpts datatype
* remove Outputable instances for types that need `StgPprOpts` to be
pretty-printed and explicitly call type specific ppr functions
* add default `panicStgPprOpts` for panic messages (when it's not
convenient to thread StgPprOpts or DynFlags down to the ppr function
call)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/863c544c9849e49872acac64b8faea56a3311564">863c544c</a></strong>
<div>
<span>by Mark</span>
<i>at 2020-07-21T06:39:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix a typo in existential_quantification.rst</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/05910be1ac5c1f485132d2c8bd1ceb4f86e06db5">05910be1</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-07-21T14:47:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add release notes entry for #17816
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a625719284db7c69fa3d122e829291a16960e85f">a6257192</a></strong>
<div>
<span>by Matthew Pickering</span>
<i>at 2020-07-21T14:47:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use a newtype `Code` for the return type of typed quotations (Proposal #195)
There are three problems with the current API:
1. It is hard to properly write instances for ``Quote m => m (TExp a)`` as the type is the composition
of two type constructors. Doing so in your program involves making your own newtype and
doing a lot of wrapping/unwrapping.
For example, if I want to create a language which I can either run immediately or
generate code from I could write the following with the new API. ::
class Lang r where
_int :: Int -> r Int
_if :: r Bool -> r a -> r a -> r a
instance Lang Identity where
_int = Identity
_if (Identity b) (Identity t) (Identity f) = Identity (if b then t else f)
instance Quote m => Lang (Code m) where
_int = liftTyped
_if cb ct cf = [|| if $$cb then $$ct else $$cf ||]
2. When doing code generation it is common to want to store code fragments in
a map. When doing typed code generation, these code fragments contain a
type index so it is desirable to store them in one of the parameterised
map data types such as ``DMap`` from ``dependent-map`` or ``MapF`` from
``parameterized-utils``.
::
compiler :: Env -> AST a -> Code Q a
data AST a where ...
data Ident a = ...
type Env = MapF Ident (Code Q)
newtype Code m a = Code (m (TExp a))
In this example, the ``MapF`` maps an ``Ident String`` directly to a ``Code Q String``.
Using one of these map types currently requires creating your own newtype and constantly
wrapping every quotation and unwrapping it when using a splice. Achievable, but
it creates even more syntactic noise than normal metaprogramming.
3. ``m (TExp a)`` is ugly to read and write, understanding ``Code m a`` is
easier. This is a weak reason but one everyone
can surely agree with.
Updates text submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/58235d46bd4e9fbf69bd82969b29cd9c6ab051e1">58235d46</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-07-21T14:47:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Fix :rts-flag:`--copying-gc` documentation
It was missing a newline.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
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<a href="#06764eb0158306b83ab1998d18316392a51838c2">
compiler/GHC/Builtin/Names/TH.hs
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<a href="#d79a8a61508cb6c5f38a23ab2b691bb77306f672">
compiler/GHC/CoreToStg.hs
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<a href="#9a679a2680ef6061397f1987091ea9f96ffe095d">
compiler/GHC/Driver/Main.hs
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<a href="#305c148430a70c23122a9aed4b8b89d96bf14b46">
compiler/GHC/Stg/DepAnal.hs
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<a href="#cfd807bd18e4d16c58aee578cf320694fbb0782e">
compiler/GHC/Stg/Lift.hs
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<a href="#395cb654293c1fc577e034de4856683f093cc356">
compiler/GHC/Stg/Lint.hs
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<a href="#6c6b170dad20b4eedb2e77f6777d30c062f9bcb1">
compiler/GHC/Stg/Pipeline.hs
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<a href="#ab7f5bb638d3dce352affbd617434b76735301b0">
compiler/GHC/Stg/Syntax.hs
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<a href="#4675150d494f381e32f32e7b58c494b88e8d2584">
compiler/GHC/Stg/Unarise.hs
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<a href="#3aa56839e36b2219f9ad54f5646ef3005da9c672">
compiler/GHC/Tc/Deriv/Generate.hs
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<a href="#9ea832ccdb4b5f7508a1efd6caedeafa16b269e7">
compiler/GHC/Tc/Gen/Splice.hs
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<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
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<a href="#bdbe6161ac51a0072a62bb6ddfca5b31edfc51ff">
docs/users_guide/exts/deriving_extra.rst
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<a href="#7ac989ce2970eedd8fbc550755c61f8fb2a48e91">
docs/users_guide/exts/existential_quantification.rst
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<a href="#f0474104bf5123c0904d8fa7745d89840c730d16">
docs/users_guide/exts/template_haskell.rst
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<a href="#6ae923e173536bf0ddb39552416a7e21767287db">
docs/users_guide/runtime_control.rst
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<a href="#b1ae9d61e7dc1aafaeeab37b56c3a045e926a855">
libraries/template-haskell/Language/Haskell/TH.hs
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<a href="#dfa65b2523e009fd5494554a82e58536f442a6be">
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libraries/template-haskell/Language/Haskell/TH/CodeDo.hs
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<a href="#556b3bb7c75dfe37155d079195cb9671e3061783">
libraries/template-haskell/Language/Haskell/TH/Lib.hs
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<a href="#97b63f699307e7a6d92425265508cfc9e963c336">
libraries/template-haskell/Language/Haskell/TH/Lib/Internal.hs
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<a href="#ed3c6537b674490396f9cab5cbb014ee54e71168">
libraries/template-haskell/Language/Haskell/TH/Syntax.hs
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<a href="#ee61d093f9c845475278836990fdde8877a1de02">
libraries/template-haskell/changelog.md
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<a href="#8f8341958f03c71e1eee3b82a943baee4c8d42f6">
libraries/template-haskell/template-haskell.cabal.in
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<a href="#2d19e6cbace295d14f756857b7a73e885bca99f3">
libraries/text
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<a href="#03f37b664b8d39fa3a162ae50b5010c251ebcebc">
testsuite/tests/deriving/should_compile/drv-empty-data.stderr
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<li class="file-stats">
<a href="#d481260600d885b29b51ded399c9a6cfe2e35d5e">
testsuite/tests/parser/should_compile/Proposal229f_instances.hs
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<li class="file-stats">
<a href="#cd05355aeb6f26bd996f6097b82cf76fd3dd5c22">
testsuite/tests/partial-sigs/should_compile/TypedSplice.hs
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<li class="file-stats">
<a href="#e2dacf823e2e64f5ba90e1883b7d0727c48c5568">
testsuite/tests/partial-sigs/should_compile/TypedSplice.stderr
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<li class="file-stats">
<a href="#714003f98c966f2f558b07ec612e6fb8d3ee38bb">
testsuite/tests/quotes/T17857.hs
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<a href="#b50e1d9fe31070c946ce875e81fc7fc970636410">
testsuite/tests/th/T10945.stderr
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<h5>The diff was not included because it is too large.</h5>
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