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<h3>
Sebastian Graf pushed to branch wip/T18341
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/01ff8c89727a91cbc1571ae54f73f5919d6aaa71">01ff8c89</a></strong>
<div>
<span>by Aditya Gupta</span>
<i>at 2020-08-27T14:19:26-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Consolidate imports in getMinimalImports (#18264)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bacccb73c9b080c3c01a5e55ecb0a00cd8a77e55">bacccb73</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-08-27T14:20:01-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make {hsExpr,hsType,pat}NeedsParens aware of boxed 1-tuples
`hsExprNeedsParens`, `hsTypeNeedsParens`, and `patNeedsParens`
previously assumed that all uses of explicit tuples in the source
syntax never need to be parenthesized. This is true save for one
exception: boxed one-tuples, which use the `Solo` data type from
`GHC.Tuple` instead of special tuple syntax. This patch adds the
necessary logic to the three `*NeedsParens` functions to handle
`Solo` correctly.
Fixes #18612.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c6f50cea42a9ffc947bf4243986663cc820b0ec8">c6f50cea</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-08-28T02:22:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add missing primop documentation (#18454)
- Add three pseudoops to primops.txt.pp, so that Haddock renders
the documentation
- Update comments
- Remove special case for "->" - it's no longer exported from GHC.Prim
- Remove reference to Note [Compiling GHC.Prim] - the ad-hoc fix is no
longer there after updates to levity polymorphism.
- Document GHC.Prim
- Remove the comment that lazy is levity-polymorphic.
As far as I can tell, it never was: in 80e399639,
only the unfolding was given an open type variable.
- Remove haddock hack in GHC.Magic - no longer neccessary after
adding realWorld# to primops.txt.pp.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f065b6b012fb8f73689bc5c2a4904d5e6e377af8">f065b6b0</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-08-28T02:23:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix use distro toolchian
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4517a38215eb72a4824c72d97377b9325059bf55">4517a382</a></strong>
<div>
<span>by Tamar Christina</span>
<i>at 2020-08-28T02:23:13-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">document how build system find toolchains on Windows
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/329f7cb958551f5b384e2765a823770150152da2">329f7cb9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-31T22:59:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">base: Better error message on invalid getSystemTimerManager call
Previously we would produce a rather unhelpful pattern match failure
error in the case where the user called `getSystemTimerManager` in a
program which isn't built with `-threaded`. This understandably confused
the user in #15616.
Fixes #15616.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f6d70a8ff6a6cd628738fec902fc984936105264">f6d70a8f</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-08-31T22:59:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add tests for #15617.
Avoid a similar regression in the future.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e5969fd06ad4b4c31a8bdce51d35f9aa05594b49">e5969fd0</a></strong>
<div>
<span>by Roland Senn</span>
<i>at 2020-08-31T23:00:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add additional tests for #18172 (Followup MR 3543)
There was still one active discussion [thread](https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3543#note_284325) when MR !3543 got merged.
This MR adds the requested tests exercising the changes in
`compiler/GHC/HsToCore/Match/Literal.hs:warnAboutEmptyEnumerations` and its sub-functions.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/fe18b4825c3289089a65b7b16b25e9d216a5b0fd">fe18b482</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-08-31T23:01:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump Win32 and process submodules
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2da933084b766fc424b11f5b671574d4c7317134">2da93308</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:01:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix slow-validate flavour (#18586)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/85e13008fb9a319c0b79db7c626f37bf20731beb">85e13008</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-08-31T23:02:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update dominator code with fixes from the dom-lt package.
Two bugs turned out in the package that have been fixed since.
This MR includes this fixes in the GHC port of the code.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dffb38fab00ac1cd1cbc75156abcf373976581f7">dffb38fa</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-08-31T23:02:15-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Dominators.hs: Use unix line endings
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6189cc04ca6c3d79126744e988b487f75ccef9e2">6189cc04</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-08-31T23:02:50-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">[fixup 3433] move debugBelch into IF_DEBUG(linker)
The commit in dff1cb3d9c111808fec60190747272b973547c52 incorrectly left
the `debugBelch` function without a comment or IF_DEBUG(linker,)
decoration. This rectifies it.
Needs at least a 8.10 backport, as it was backported in 6471cc6aff80d5deebbdb1bf7b677b31ed2af3d5
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bcb68a3f7f85b9fdef6f4845e608d086b01e6a58">bcb68a3f</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:03:27-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't store HomeUnit in UnitConfig
Allow the creation of a UnitConfig (hence of a UnitState) without having
a HomeUnit. It's required for #14335.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0a3723876c6c79a0a407d50f4baa2818a13f232e">0a372387</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:04:04-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix documentation and fix "check" bignum backend (#18604)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/eb85f125a227f6b5703d4a2e997c5ea320dfa31f">eb85f125</a></strong>
<div>
<span>by Moritz Angermann</span>
<i>at 2020-08-31T23:04:39-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Set the dynamic-system-linker flag to Manual
This flag should be user controllable, hence Manual: True.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/380ef84587fb6890d100c338d1992a6994a4f02a">380ef845</a></strong>
<div>
<span>by Sven Tennie</span>
<i>at 2020-08-31T23:05:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Ignore more files
Ignore files from "new style" cabal builds (dist-newstyle folders) and
from clangd (C language server).
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74a7fbff5a8f244cd44345bf987e26413bb1989e">74a7fbff</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-31T23:05:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Limit upper version of Happy for ghc-9.0 and earlier (#18620)
This patch adds the upper bound of a happy version for ghc-9.0
and earlier.
Currently, we can't use happy-1.20.0 for ghc-9.0.
See #18620.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a4473f02ae2e685601e257b8668bea2ec721b294">a4473f02</a></strong>
<div>
<span>by Takenobu Tani</span>
<i>at 2020-08-31T23:05:51-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Limit upper version of Happy for ghc-9.2 (#18620)
This patch adds the upper bound of a happy version for ghc-9.2.
Currently, We can use happy-1.19 or happy-1.20 for ghc-9.2.
See #18620.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a8a2568b7b64e5b9fca5b12df7da759de4db39ae">a8a2568b</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-08-31T23:06:28-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add BigNat compat functions (#18613)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce810558baedc4728b9216ecfb882e97b0c2988f">ce810558</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-01T09:38:08+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add long-distance info for pattern bindings (#18572)
We didn't consider the RHS of a pattern-binding before, which led to
surprising warnings listed in #18572.
As can be seen from the regression test T18572, we get the expected
output now.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/453092e32fea5057eae9354b2444a49fa28a783f">453092e3</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-01T09:38:08+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Big refactor using guard tree variants more closely following source syntax (#18565)
Previously, we desugared and coverage checked plain guard trees as
described in Lower Your Guards. That caused (in !3849) quite a bit of
pain when we need to partially recover tree structure of the input
syntax to return covered sets for long-distance information, for
example.
In this refactor, I introduced a guard tree variant for each relevant
source syntax component of a pattern-match (mainly match groups, match,
GRHS, empty case, pattern binding). I made sure to share as much
coverage checking code as possible, so that the syntax-specific checking
functions are just wrappers around the more substantial checking
functions for the LYG primitives (`checkSequence`, `checkGrds`).
The refactoring payed off in clearer code and elimination of all panics
related to assumed guard tree structure and thus fixes #18565.
I also took the liberty to rename and re-arrange the order of functions
and comments in the module, deleted some dead and irrelevant Notes,
wrote some new ones and gave an overview module haddock.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/766aa77787547fd8d0b4d1edb1caa4415f605ba4">766aa777</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-01T09:40:19+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">.gitignore *.hiedb files
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/efa619f8b135dc4af00646fecfa2787deea1058d">efa619f8</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-01T09:52:20+02:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Handle ⊥ and strict fields correctly (#18341)
In #18341, we discovered an incorrect digression from Lower Your Guards.
This MR changes what's necessary to support properly fixing #18341.
In particular, bottomness constraints are now properly tracked in the
oracle/inhabitation testing, as an additional field
`vi_bot :: Maybe Bool` in `VarInfo`. That in turn allows us to
model newtypes as advertised in the Appendix of LYG and fix #17725.
For some reason I couldn't follow, this also fixes #18273.
I also added a couple of regression tests that were missing. Most of
them were already fixed before.
In summary, this patch fixes #18341, #17725, #18273.
</pre>
</li>
</ul>
<h4>18 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#a5cc2925ca8258af241be7e5b0381edf30266302">
.gitignore
</a>
</li>
<li class="file-stats">
<a href="#9ab3868b23ed5d5a6e12ef902049902556fa4009">
aclocal.m4
</a>
</li>
<li class="file-stats">
<a href="#d95fdf6575459444666f72b2281534e0558a4ba0">
compiler/GHC/Builtin/Utils.hs
</a>
</li>
<li class="file-stats">
<a href="#451725cc4e5d443a3b7c2adcdf224840f953b7e2">
compiler/GHC/Builtin/primops.txt.pp
</a>
</li>
<li class="file-stats">
<a href="#dafe0c717051bfbe491ee2662d7c0e72cf3c0034">
compiler/GHC/CmmToAsm/CFG/Dominators.hs
</a>
</li>
<li class="file-stats">
<a href="#6fcf64907fb5bdd93082d2d1eb94e4566e735865">
compiler/GHC/Core/DataCon.hs
</a>
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<li class="file-stats">
<a href="#2fefe3125c649bc5377b06a7cca18e785855b79c">
compiler/GHC/Data/Bag.hs
</a>
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<li class="file-stats">
<a href="#29399f07d3320158454cb214d24b4825a7bf4928">
compiler/GHC/Data/OrdList.hs
</a>
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<li class="file-stats">
<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
</a>
</li>
<li class="file-stats">
<a href="#0bae7e7e67b5f9b6ba2a371f8917cf74423a0c6f">
compiler/GHC/Hs/Pat.hs
</a>
</li>
<li class="file-stats">
<a href="#018be522bc4813b147a1525e4f96a7a493207d96">
compiler/GHC/Hs/Type.hs
</a>
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<li class="file-stats">
<a href="#65e2067fbb7377818b6cadff0531f44029499948">
compiler/GHC/HsToCore/Binds.hs
</a>
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<li class="file-stats">
<a href="#6bdd5abc649727f2a802bc96ce5c276de19d3726">
compiler/GHC/HsToCore/Expr.hs
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<li class="file-stats">
<a href="#83f0b13548ac43fe13b1813fb407249ff9b825f7">
compiler/GHC/HsToCore/GuardedRHSs.hs
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<li class="file-stats">
<a href="#912bb8ed70a132c8eb2e037f8c9ecb045d2c229c">
compiler/GHC/HsToCore/ListComp.hs
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<li class="file-stats">
<a href="#085703923f9c18f6ac9f926ac9a4c7c7e6d9d9ed">
compiler/GHC/HsToCore/Match.hs
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<li class="file-stats">
<a href="#7c474b472edbb70d6316b45cccdb0c78321e94d3">
compiler/GHC/HsToCore/Match.hs-boot
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<li class="file-stats">
<a href="#c8a27621f82549165d8946ae8e9f467660958059">
compiler/GHC/HsToCore/Monad.hs
</a>
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</ul>
<h5>The diff was not included because it is too large.</h5>
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