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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/8c892689058912c35ed36e07b5a9ed0df86abc03">8c892689</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-09T11:19:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: add OptCoercionOpts
Use OptCoercionOpts to avoid threading DynFlags all the way down to
GHC.Core.Coercion.Opt
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/3f32a9c0f4ddceab14a381bfd3732bcad6be43f7">3f32a9c0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-09T11:19:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: add UnfoldingOpts and SimpleOpts
Milestone: after this patch, we only use 'unsafeGlobalDynFlags' for the
state hack and for debug in Outputable.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3df72a699727b00d5dd8212fcbe46cbbec05f9b">b3df72a6</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-09T11:19:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">DynFlags: add sm_pre_inline field into SimplMode (#17957)
It avoids passing and querying DynFlags down in the simplifier.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ffae57921168365272bf7ce8aaa645917bfdf218">ffae5792</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-09T11:19:24-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add comments about sm_dflags and simpleOptExpr
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7911d0d983a68eb0d54d7c1ba51326d6be737aae">7911d0d9</a></strong>
<div>
<span>by Alan Zimmerman</span>
<i>at 2020-09-09T11:20:03-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove GENERATED pragma, as it is not being used
@alanz pointed out on ghc-devs that the payload of this pragma does
not appear to be used anywhere.
I (@bgamari) did some digging and traced the pragma's addition back to
d386e0d2 (way back in 2006!).
It appears that it was intended to be used by code generators for use
in informing the code coveraging checker about generated code
provenance. When it was added it used the pragma's "payload" fields as
source location information to build an "ExternalBox". However, it
looks like this was dropped a year later in 55a5d8d9. At this point
it seems like the pragma serves no useful purpose.
Given that it also is not documented, I think we should remove it.
Updates haddock submodule
Closes #18639
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5aae5b325ccef857800f1840665a0e1b152e9b88">5aae5b32</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-09T18:31:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump Docker images
We now generate our Docker images via Dhall definitions, as described in
ghc/ci-images!52. Additionally, we are far more careful about where tools
come from, using the ALEX, HAPPY, HSCOLOR, and GHC environment variables
(set in the Dockerfiles) to find bootstrapping tools.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4ce9fe88e7e98178d5fd6b18ac9cba666a1f8306">4ce9fe88</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-09T18:31:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Fix leakage of GHC in PATH into build
Previously hadrian would use GHC on PATH when configuring packages (or
fail if there is no such GHC). Fix this. Unfortunately this runs into
another bug in Cabal which we workaround.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/291a15dd8dfc03d493c0db36a9cb62fd4867db10">291a15dd</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-09T18:31:40-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">utils: Bump cabal-version of hp2ps and unlit
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4798caa0fefd7adf4c5b85fa84a6f28fcc6b350b">4798caa0</a></strong>
<div>
<span>by David Himmelstrup</span>
<i>at 2020-09-09T18:32:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts comment: RTS_TICKY_SYMBOLS moved from rts/Linker.c to rts/RtsSymbols.c
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/67ce72da1689058cb689ffbb6fcbd5cd12af56df">67ce72da</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-10T10:35:33-04:00</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/1207576ac0cfdd3fe1ea00b5505f7c874613451e">1207576a</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-10T10:35:33-04:00</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/95455982df1ef15c6d4585a7d3e93b5e75146a07">95455982</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-09-10T10:36:09-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">hadrian: Don't include -fdiagnostics-color in argument hash
Otherwise the input hash will vary with whether colors are requested,
which changed with `isatty`.
Fixes #18672.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6abe4a1c427a511aa698424055639ea789fccf97">6abe4a1c</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-10T17:02:00+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/3777be14e104f040b826762f5ab42a8b898d85ae">3777be14</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-10T17:03:12+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.
Proper handling of ⊥ also fixes #17977 (once again) and fixes #18670.
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, #17977 and #18670.
Metric Decrease:
T12227
</pre>
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