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<h3>
Sebastian Graf pushed to branch wip/T18793
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/990ea991a1c35fdb894fcb91f919fb8f8fed33dd">990ea991</a></strong>
<div>
<span>by Daniel Rogozin</span>
<i>at 2020-10-11T22:20:04+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fall back to types when looking up data constructors (#18740)
Before this patch, referring to a data constructor in a term-level
context led to a scoping error:
ghci> id Int
<interactive>:1:4: error: Data constructor not in scope: Int
After this patch, the renamer falls back to the type namespace
and successfully finds the Int. It is then rejected in the type
checker with a more useful error message:
<interactive>:1:4: error:
• Illegal term-level use of the type constructor ‘Int’
imported from ‘Prelude’ (and originally defined in ‘GHC.Types’)
• In the first argument of ‘id’, namely ‘Int’
In the expression: id Int
We also do this for type variables.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/9bbc84d20d0f50901351246cbe97c45234ca7d95">9bbc84d2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-12T18:21:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: refactor DmdAnal
Make demand analysis usable without having to provide DynFlags.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7fdcce6d4d13a10a1b2336c1d40482c64dba664d">7fdcce6d</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-10-13T00:12:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Initial ShortText code and conversion of package db code
Metric Decrease:
Naperian
T10421
T10421a
T10547
T12150
T12234
T12425
T13035
T18140
T18304
T5837
T6048
T13253-spj
T18282
T18223
T3064
T9961
Metric Increase
T13701
HFSKJH
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a5f29185921cf2af908988ab3608602bcb40290">0a5f2918</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-13T00:13:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Parser: don't require the HomeUnitId
The HomeUnitId is only used by the Cmm parser and this one has access to
the DynFlags, so it can grab the UnitId of the HomeUnit from them.
Bump haddock submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8f4f5794eb3504bf2ca093dc5895742395fdbde9">8f4f5794</a></strong>
<div>
<span>by HaskellMouse</span>
<i>at 2020-10-13T13:05:49+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Unification of Nat and Naturals
This commit removes the separate kind 'Nat' and enables promotion
of type 'Natural' for using as type literal.
It partially solves #10776
Now the following code will be successfully typechecked:
data C = MkC Natural
type CC = MkC 1
Before this change we had to create the separate type for promotion
data C = MkC Natural
data CP = MkCP Nat
type CC = MkCP 1
But CP is uninhabited in terms.
For backward compatibility type synonym `Nat` has been made:
type Nat = Natural
The user's documentation and tests have been updated.
The haddock submodule also have been updated.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0fc1cb54d1afc0f002deb4d080c9b824f423b647">0fc1cb54</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-14T03:42:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Verify that Hadrian builds with Stack
As noted in #18726, this regularly breaks. Let's test it.
Note that we don't actually perform a build of GHC itself; we merely
test that the Hadrian executable builds and works (by invoking `hadrian
--version`).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/89f4d8e950a1ed2a3ffab424233d3bcd243b1771">89f4d8e9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-14T12:03:57-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump LLVM version to 10.0
Fixes #18267.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/716385c90f2f89ac45e256cdb7cdada1981b31ad">716385c9</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-10-14T12:04:34-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make DataKinds the sole arbiter of kind-level literals (and friends)
Previously, the use of kind-level literals, promoted tuples,
and promoted lists required enabling both `DataKinds` and
`PolyKinds`. This made sense back in a `TypeInType` world, but not so
much now that `TypeInType`'s role has been superseded. Nowadays,
`PolyKinds` only controls kind polymorphism, so let's make `DataKinds`
the thing that controls the other aspects of `TypeInType`, which include
literals, promoted tuples and promoted lists.
There are some other things that overzealously required `PolyKinds`,
which this patch fixes as well:
* Previously, using constraints in kinds (e.g., `data T :: () -> Type`)
required `PolyKinds`, despite the fact that this is orthogonal to kind
polymorphism. This now requires `DataKinds` instead.
* Previously, using kind annotations in kinds
(e.g., `data T :: (Type :: Type) -> Type`) required both `KindSignatures`
and `PolyKinds`. This doesn't make much sense, so it only requires
`KindSignatures` now.
Fixes #18831.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ac300a0d49343e6a558dc36d94fc558f51d43bb2">ac300a0d</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-14T12:05:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove "Operator sections" from docs/users_guide/bugs.rst
The issue described in that section was fixed by
2b89ca5b850b4097447cc4908cbb0631011ce979
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bf2411a3c198cb2df93a9e0aa0c3b8297f47058d">bf2411a3</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-10-14T12:05:11-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix PostfixOperators (#18151)
This fixes a regression introduced in 2b89ca5b850b4097447cc4908cbb0631011ce979
See the new T18151x test case.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e60ae8a38394370fd8818ad004a101466fc7d2dc">e60ae8a3</a></strong>
<div>
<span>by Fumiaki Kinoshita</span>
<i>at 2020-10-14T18:06:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add -Wnoncanonical-{monad,monoid}-instances to standardWarnings
-------------------------
Metric Decrease:
T12425
Metric Increase:
T17516
-------------------------
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15d2340cb9dc833adb87784e6de86dba235290f7">15d2340c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-10-14T18:06:48-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix some missed opportunities for preInlineUnconditionally
There are two signficant changes here:
* Ticket #18815 showed that we were missing some opportunities for
preInlineUnconditionally. The one-line fix is in the code for
GHC.Core.Opt.Simplify.Utils.preInlineUnconditionally, which now
switches off only for INLINE pragmas. I expanded
Note [Stable unfoldings and preInlineUnconditionally] to explain.
* When doing this I discovered a way in which preInlineUnconditionally
was occasionally /too/ eager. It's all explained in
Note [Occurrences in stable unfoldings] in GHC.Core.Opt.OccurAnal,
and the one-line change adding markAllMany to occAnalUnfolding.
I also got confused about what NoUserInline meant, so I've renamed
it to NoUserInlinePrag, and changed its pretty-printing slightly.
That led to soem error messate wibbling, and touches quite a few
files, but there is no change in functionality.
I did a nofib run. As expected, no significant changes.
Program Size Allocs
----------------------------------------
sphere -0.0% -0.4%
----------------------------------------
Min -0.0% -0.4%
Max -0.0% +0.0%
Geometric Mean -0.0% -0.0%
I'm allowing a max-residency increase for T10370, which seems
very irreproducible. (See comments on !4241.) There is always
sampling error for max-residency measurements; and in any case
the change shows up on some platforms but not others.
Metric Increase:
T10370
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0c4bfed849d454bee707fcb2989eb7c6339eaedb">0c4bfed8</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-14T18:07:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users-guide: Add missing :ghc-flag: directive</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/51c4b851965abdece2f88f8e583256e15f3140fe">51c4b851</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-15T04:30:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove Proxy# argument in Data.Typeable.Internal
No longer neccessary - TypeRep is now indexed, there is no ambiguity.
Also fix a comment in Evidence.hs, IsLabel no longer takes a Proxy#.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/809f09e8a7060691b1f2f5d6b95ca75e66437e55">809f09e8</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-10-15T04:31:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix parsing of PIE flags
-fPIE and -fno-PIE flags were (un)setting Opt_PIC instead of Opt_PIE.
Original commit: 3625728a0e3a9b56c2b85ae7ea8bcabdd83ece6a
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3d7db1488c4bd7764e8b1fe3cfde4c5a548cde16">3d7db148</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-10-15T04:31:42-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">testsuite: Add missing #include on <stdlib.h>
This otherwise fails on newer Clangs, which warn
more aggressively on undeclared symbols.</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f075090b210bc23ecbe3d3963da72362df84fa9f">f075090b</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-10-15T12:23:30+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arity: Refactor fixed-point iteration in GHC.Core.Opt.Arity
Arity analysis used to propagate optimistic arity types during
fixed-point interation through the `ArityEnv`'s `ae_cheap_fun` field,
which is like `GHC.Core.Utils.exprIsCheap`, but also considers the
current iteration's optimistic arity, for the binder in question only.
In #18793, we have seen that this is a problematic design, because it
doesn't allow us to look through PAP bindings of that binder.
Hence this patch refactors to a more traditional form with an explicit
signature environment, in which we record the optimistic `ArityType` of
the binder in question (and at the moment is the *only* binder that is
recorded in the arity environment).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e956d42a920ca19682d1386008e89f011e72632a">e956d42a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-10-15T12:37:43+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Arity: Record arity types for non-recursive lets
In #18793, we saw a compelling example which requires us to look at
non-recursive let-bindings during arity analysis and unleash their arity
types at use sites.
After the refactoring in the previous patch, the needed change is quite
simple and very local to `arityType`'s defn for non-recurisve `Let`.
Apart from that, we had to get rid of the second item of
`Note [Dealing with bottoms]`, which was entirely a safety measure and
hindered optimistic fixed-point iteration.
Fixes #18793.
The following metric increases are all caused by this commit and a
result of the fact that we just do more work now:
Metric Increase:
T3294
T12545
T12707
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ef3e4b2cb6e2d57951052420fe0bf6ec11011a83">ef3e4b2c</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-10-15T12:37:51+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Testsuite: Add dead arity analysis tests
We didn't seem to test these old tests at all, judging from their
expected output.
</pre>
</li>
</ul>
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.gitlab-ci.yml
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compiler/GHC/Builtin/Names.hs
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compiler/GHC/Builtin/Types.hs
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compiler/GHC/Builtin/Types.hs-boot
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compiler/GHC/Builtin/Types/Literals.hs
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compiler/GHC/Cmm/Lexer.x
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compiler/GHC/Cmm/Parser.y
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compiler/GHC/Cmm/Monad.hs
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compiler/GHC/Cmm/Parser/Monad.hs
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compiler/GHC/Core/Opt/Arity.hs
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compiler/GHC/Core/Opt/DmdAnal.hs
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compiler/GHC/Core/Opt/OccurAnal.hs
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compiler/GHC/Core/Opt/Pipeline.hs
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compiler/GHC/Core/Opt/Simplify.hs
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compiler/GHC/Parser.y
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