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<h3>
Ben Gamari pushed to branch wip/T18291
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/cb5c31b51b021ce86890bba73276fe6f7405f5d3">cb5c31b5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-03T17:55:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Allow ARMv7 job to fail
Due to #18298.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/32a4ae90b50cc56f2955f489ad0cf8c7ff5e131a">32a4ae90</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-06-04T04:34:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Clean up boot vs non-boot disambiguating types
We often have (ModuleName, Bool) or (Module, Bool) pairs for "extended"
module names (without or with a unit id) disambiguating boot and normal
modules. We think this is important enough across the compiler that it
deserves a new nominal product type. We do this with synnoyms and a
functor named with a `Gen` prefix, matching other newly created
definitions.
It was also requested that we keep custom `IsBoot` / `NotBoot` sum type.
So we have it too. This means changing many the many bools to use that
instead.
Updates `haddock` submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c05756cdef800f1d8e92114222bcc480bce758b9">c05756cd</a></strong>
<div>
<span>by Niklas Hambüchen</span>
<i>at 2020-06-04T04:35:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: Add more details on InterruptibleFFI.
Details from https://gitlab.haskell.org/ghc/ghc/issues/8684
and https://github.com/takano-akio/filelock/pull/7#discussion_r280332430
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1b975aedb1b74b8694d14ba8fdc5955497f8f31c">1b975aed</a></strong>
<div>
<span>by Andrew Martin</span>
<i>at 2020-06-04T04:36:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow finalizeForeignPtr to be called on FinalPtr/PlainPtr.
MR 2165 (commit 49301ad6226d9a83d110bee8c419615dd94f5ded) regressed
finalizeForeignPtr by throwing exceptions when PlainPtr was encounterd.
This regression did not make it into a release of GHC. Here, the
original behavior is restored, and FinalPtr is given the same treatment
as PlainPtr.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2bd3929ad1b06b01c1d22d513902507eefadc131">2bd3929a</a></strong>
<div>
<span>by Luke Lau</span>
<i>at 2020-06-04T04:36:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix documentation on type families not being extracted
It looks like the location of the Names used for CoAxioms on type
families are now located at their type constructors. Previously, Docs.hs
thought the Names were located in the RHS, so the RealSrcSpan in the
instanceMap and getInstLoc didn't match up. Fixes #18241
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6735b9d94605b4c7f75e70339bfaa4207f23e52b">6735b9d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-04T04:37:21-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">GHC.Hs.Instances: Compile with -O0
This module contains exclusively Data instances, which are going to be
slow no matter what we do. Furthermore, they are incredibly slow to
compile with optimisation (see #9557). Consequently we compile this with
-O0. See #18254.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c330331adc0a686f24b94844d0eb3a0711b928d7">c330331a</a></strong>
<div>
<span>by nineonine</span>
<i>at 2020-06-04T04:37:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add test for #17669
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cab684f0857c71c40996201d6fb3ba93eb38a701">cab684f0</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-04T04:38:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Add Windows-specific implementation of rtsSleep
Previously we would use the POSIX path, which uses `nanosleep`. However,
it turns out that `nanosleep` is provided by `libpthread` on Windows. In
general we don't want to incur such a dependency. Avoid this by simply
using `Sleep` on Windows.
Fixes #18272.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ad44b50484f27beceab8213a061aa60c7a03f7ca">ad44b504</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-04T04:38:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">compiler: Disable use of process jobs with process < 1.6.9
Due to #17926.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a4098a4bb89b3d30cca26d82b82724913062536">6a4098a4</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-04T04:55:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[linker] Adds void printLoadedObjects(void);
This allows us to dump in-memory object code locations for debugging.
Fixup printLoadedObjects prototype
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af5e3a885ddd09dd5f550552c535af3661ff3dbf">af5e3a88</a></strong>
<div>
<span>by Artem Pelenitsyn</span>
<i>at 2020-06-05T03:18:49-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: fix sign confusion in log1mexp implementation (fix #17125)
author: claude (https://gitlab.haskell.org/trac-claude)
The correct threshold for log1mexp is -(log 2) with the current specification
of log1mexp. This change improves accuracy for large negative inputs.
To avoid code duplication, a small helper function is added;
it isn't the default implementation in Floating because it needs Ord.
This patch does nothing to address that the Haskell specification is
different from that in common use in other languages.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2b792facab46f7cdd09d12e79499f4e0dcd4293f">2b792fac</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-06-05T09:27:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simple subsumption
This patch simplifies GHC to use simple subsumption.
Ticket #17775
Implements GHC proposal #287
https://github.com/ghc-proposals/ghc-proposals/blob/master/
proposals/0287-simplify-subsumption.rst
All the motivation is described there; I will not repeat it here.
The implementation payload:
* tcSubType and friends become noticably simpler, because it no
longer uses eta-expansion when checking subsumption.
* No deeplyInstantiate or deeplySkolemise
That in turn means that some tests fail, by design; they can all
be fixed by eta expansion. There is a list of such changes below.
Implementing the patch led me into a variety of sticky corners, so
the patch includes several othe changes, some quite significant:
* I made String wired-in, so that
"foo" :: String rather than
"foo" :: [Char]
This improves error messages, and fixes #15679
* The pattern match checker relies on knowing about in-scope equality
constraints, andd adds them to the desugarer's environment using
addTyCsDs. But the co_fn in a FunBind was missed, and for some reason
simple-subsumption ends up with dictionaries there. So I added a
call to addTyCsDs. This is really part of #18049.
* I moved the ic_telescope field out of Implication and into
ForAllSkol instead. This is a nice win; just expresses the code
much better.
* There was a bug in GHC.Tc.TyCl.Instance.tcDataFamInstHeader.
We called checkDataKindSig inside tc_kind_sig, /before/
solveEqualities and zonking. Obviously wrong, easily fixed.
* solveLocalEqualitiesX: there was a whole mess in here, around
failing fast enough. I discovered a bad latent bug where we
could successfully kind-check a type signature, and use it,
but have unsolved constraints that could fill in coercion
holes in that signature -- aargh.
It's all explained in Note [Failure in local type signatures]
in GHC.Tc.Solver. Much better now.
* I fixed a serious bug in anonymous type holes. IN
f :: Int -> (forall a. a -> _) -> Int
that "_" should be a unification variable at the /outer/
level; it cannot be instantiated to 'a'. This was plain
wrong. New fields mode_lvl and mode_holes in TcTyMode,
and auxiliary data type GHC.Tc.Gen.HsType.HoleMode.
This fixes #16292, but makes no progress towards the more
ambitious #16082
* I got sucked into an enormous refactoring of the reporting of
equality errors in GHC.Tc.Errors, especially in
mkEqErr1
mkTyVarEqErr
misMatchMsg
misMatchMsgOrCND
In particular, the very tricky mkExpectedActualMsg function
is gone.
It took me a full day. But the result is far easier to understand.
(Still not easy!) This led to various minor improvements in error
output, and an enormous number of test-case error wibbles.
One particular point: for occurs-check errors I now just say
Can't match 'a' against '[a]'
rather than using the intimidating language of "occurs check".
* Pretty-printing AbsBinds
Tests review
* Eta expansions
T11305: one eta expansion
T12082: one eta expansion (undefined)
T13585a: one eta expansion
T3102: one eta expansion
T3692: two eta expansions (tricky)
T2239: two eta expansions
T16473: one eta
determ004: two eta expansions (undefined)
annfail06: two eta (undefined)
T17923: four eta expansions (a strange program indeed!)
tcrun035: one eta expansion
* Ambiguity check at higher rank. Now that we have simple
subsumption, a type like
f :: (forall a. Eq a => Int) -> Int
is no longer ambiguous, because we could write
g :: (forall a. Eq a => Int) -> Int
g = f
and it'd typecheck just fine. But f's type is a bit
suspicious, and we might want to consider making the
ambiguity check do a check on each sub-term. Meanwhile,
these tests are accepted, whereas they were previously
rejected as ambiguous:
T7220a
T15438
T10503
T9222
* Some more interesting error message wibbles
T13381: Fine: one error (Int ~ Exp Int)
rather than two (Int ~ Exp Int, Exp Int ~ Int)
T9834: Small change in error (improvement)
T10619: Improved
T2414: Small change, due to order of unification, fine
T2534: A very simple case in which a change of unification order
means we get tow unsolved constraints instead of one
tc211: bizarre impredicative tests; just accept this for now
Updates Cabal and haddock submodules.
Metric Increase:
T12150
T12234
T5837
haddock.base
Metric Decrease:
haddock.compiler
haddock.Cabal
haddock.base
Merge note: This appears to break the
`UnliftedNewtypesDifficultUnification` test. It has been marked as
broken in the interest of merging.
(cherry picked from commit 66b7b195cb3dce93ed5078b80bf568efae904cc5)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2dff814158e08aed53036bf6ebd7c3c8394af438">2dff8141</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-05T14:21:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Simplify bindLHsTyVarBndrs and bindHsQTyVars
Both `bindLHsTyVarBndrs` and `bindHsQTyVars` take two separate
`Maybe` arguments, which I find terribly confusing. Thankfully, it's
possible to remove one `Maybe` argument from each of these functions,
which this patch accomplishes:
* `bindHsQTyVars` takes a `Maybe SDoc` argument, which is `Just` if
GHC should warn about any of the quantified type variables going
unused. However, every call site uses `Nothing` in practice. This
makes sense, since it doesn't really make sense to warn about
unused type variables bound by an `LHsQTyVars`. For instance, you
wouldn't warn about the `a` in `data Proxy a = Proxy` going unused.
As a result, I simply remove this `Maybe SDoc` argument altogether.
* `bindLHsTyVarBndrs` also takes a `Maybe SDoc` argument for the same
reasons that `bindHsQTyVars` took one. To make things more
confusing, however, `bindLHsTyVarBndrs` also takes a separate
`HsDocContext` argument, which is pretty-printed (to an `SDoc`) in
warnings and error messages.
In practice, the `Maybe SDoc` and the `HsDocContext` often contain
the same text. See the call sites for `bindLHsTyVarBndrs` in
`rnFamInstEqn` and `rnConDecl`, for instance. There are only a
handful of call sites where the text differs between the
`Maybe SDoc` and `HsDocContext` arguments:
* In `rnHsRuleDecl`, where the `Maybe SDoc` says "`In the rule`"
and the `HsDocContext` says "`In the transformation rule`".
* In `rnHsTyKi`/`rn_ty`, where the `Maybe SDoc` says
"`In the type`" but the `HsDocContext` is inhereted from the
surrounding context (e.g., if `rnHsTyKi` were called on a
top-level type signature, the `HsDocContext` would be
"`In the type signature`" instead)
In both cases, warnings/error messages arguably _improve_ by
unifying making the `Maybe SDoc`'s text match that of the
`HsDocContext`. As a result, I decided to remove the `Maybe SDoc`
argument to `bindLHsTyVarBndrs` entirely and simply reuse the text
from the `HsDocContext`. (I decided to change the phrase
"transformation rule" to "rewrite rule" while I was in the area.)
The `Maybe SDoc` argument has one other purpose: signaling when to
emit "`Unused quantified type variable`" warnings. To recover this
functionality, I replaced the `Maybe SDoc` argument with a
boolean-like `WarnUnusedForalls` argument. The only
`bindLHsTyVarBndrs` call site that chooses _not_ to emit these
warnings in `bindHsQTyVars`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e372331b3212e5d8eddfa6f8d2c3840b7e95c2b3">e372331b</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-07T08:46:41-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Add missing deriveConstants dependency on ghcplatform.h
deriveConstants wants to compile C sources which #include PosixSource.h,
which itself #includes ghcplatform.h. Make sure that Hadrian knows
about this dependency.
Fixes #18290.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b022051a50d30e39d86ee21e565e899e7e98255f">b022051a</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-07T08:46:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghc-prim needs to depend on libc and libm
libm is just an empty shell on musl, and all the math functions are contained in
libc.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6dae65484f9552239652f743e2303fa17aae953b">6dae6548</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-07T08:46:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disable DLL loading if without system linker
Some platforms (musl, aarch64) do not have a working dynamic linker
implemented in the libc, even though we might see dlopen. It will
ultimately just return that this is not supported. Hence we'll add
a flag to the compiler to flat our disable loading dlls. This is
needed as we will otherwise try to load the shared library even
if this will subsequently fail. At that point we have given up
looking for static options though.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a158ffc4e0ac250897aefaf6caf03eb5f688182">4a158ffc</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-06-07T08:46:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Range is actually +/-2^32, not +/-2^31
See also: https://static.docs.arm.com/ihi0056/g/aaelf64.pdf
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f1bfb806683b3092fc5ead84e7ecff928c55fbc4">f1bfb806</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-07T10:49:30-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">OccurAnal: Avoid exponential behavior due to where clauses
Previously the `Var` case of `occAnalApp` could in some cases (namely
in the case of `runRW#` applications) call `occAnalRhs` two. In the case
of nested `runRW#`s this results in exponential complexity. In some
cases the compilation time that resulted would be very long indeed
(see #18296).
Fixes #18296.
Metric Decrease:
T9961
T12150
T12234
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9b607671b9158c60470b2bd57804a7684d3ea33f">9b607671</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-06-09T08:05:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add link to GHC's wiki in the GHC API header
This adds a URL to point to GHC's wiki in the GHC API header.
Newcomers could easily find more information from the GHC API's
web like [1].
[1]: Current version, https://ghc.gitlab.haskell.org/ghc/doc/libraries/ghc-8.11.0.20200604/index.html
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/72c7fe9a1e147dfeaf043f6d591d724a126cce45">72c7fe9a</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-06-09T08:06:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make GADT constructors adhere to the forall-or-nothing rule properly
Issue #18191 revealed that the types of GADT constructors don't quite
adhere to the `forall`-or-nothing rule. This patch serves to clean up
this sad state of affairs somewhat. The main change is not in the
code itself, but in the documentation, as this patch introduces two
sections to the GHC User's Guide:
* A "Formal syntax for GADTs" section that presents a BNF-style
grammar for what is and isn't allowed in GADT constructor types.
This mostly exists to codify GHC's existing behavior, but it also
imposes a new restriction that addresses #18191: the outermost
`forall` and/or context in a GADT constructor is not allowed to be
surrounded by parentheses. Doing so would make these
`forall`s/contexts nested, and GADTs do not support nested
`forall`s/contexts at present.
* A "`forall`-or-nothing rule" section that describes exactly what
the `forall`-or-nothing rule is all about. Surprisingly, there was
no mention of this anywhere in the User's Guide up until now!
To adhere the new specification in the "Formal syntax for GADTs"
section of the User's Guide, the following code changes were made:
* A new function, `GHC.Hs.Type.splitLHsGADTPrefixTy`, was introduced.
This is very much like `splitLHsSigmaTy`, except that it avoids
splitting apart any parentheses, which can be syntactically
significant for GADT types. See
`Note [No nested foralls or contexts in GADT constructors]` in
`GHC.Hs.Type`.
* `ConDeclGADTPrefixPs`, an extension constructor for `XConDecl`, was
introduced so that `GHC.Parser.PostProcess.mkGadtDecl` can return
it when given a prefix GADT constructor. Unlike `ConDeclGADT`,
`ConDeclGADTPrefixPs` does not split the GADT type into its argument
and result types, as this cannot be done until after the type is
renamed (see `Note [GADT abstract syntax]` in `GHC.Hs.Decls` for why
this is the case).
* `GHC.Renamer.Module.rnConDecl` now has an additional case for
`ConDeclGADTPrefixPs` that (1) splits apart the full `LHsType` into
its `forall`s, context, argument types, and result type, and
(2) checks for nested `forall`s/contexts. Step (2) used to be
performed the typechecker (in `GHC.Tc.TyCl.badDataConTyCon`) rather
than the renamer, but now the relevant code from the typechecker
can simply be deleted.
One nice side effect of this change is that we are able to give a
more accurate error message for GADT constructors that use visible
dependent quantification (e.g., `MkFoo :: forall a -> a -> Foo a`),
which improves the stderr in the `T16326_Fail6` test case.
Fixes #18191. Bumps the Haddock submodule.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b83cdfd60d53198888ff5e9f2f9f9977d904d782">b83cdfd6</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-09T09:50:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Allow unsaturated runRW# applications
Previously we had a very aggressive Core Lint check which caught
unsaturated applications of runRW#. However, there is nothing
wrong with such applications and they may naturally arise in desugared
Core. For instance, the desugared Core of Data.Primitive.Array.runArray#
from the `primitive` package contains:
case ($) (runRW# @_ @_) (\s -> ...) of ...
In this case it's almost certain that ($) will be inlined, turning the
application into a saturated application. However, even if this weren't
the case there isn't a problem: CorePrep (after deleting an unnecessary
case) can simply generate code in its usual way, resulting in a call to
the Haskell definition of runRW#.
Fixes #18291.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fae75e43568449cef86cf21af278c4efa33dac59">fae75e43</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-06-09T09:50:33-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add test for #18291
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
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.gitlab-ci.yml
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<a href="#d0d96a6d03668aeab20ebe05e2c4ccb798c7e64c">
compiler/GHC.hs
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compiler/GHC/Builtin/Names.hs
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compiler/GHC/Builtin/Types.hs
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