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<h3>
Simon Peyton Jones pushed to branch wip/T18126
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/35a7b7ecabeba39e53d6dea78ecc2d3eca8b1b24">35a7b7ec</a></strong>
<div>
<span>by Adam Sandberg Eriksson</span>
<i>at 2020-09-14T17:46:16-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">docs: -B rts option sounds the bell on every GC (#18351)</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5ae8212c3d2f284bc18a562625be3f4640984497">5ae8212c</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-09-14T17:46:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Populate gitlab cache after building
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a5ffb39afc386729c821b924dd2c6a93917e1b5f">a5ffb39a</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-09-14T17:46:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Move ahead cabal cache restoration to before use of cabal
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e8b37c21fdcb9ca515e3dd2fab1661b7792fb728">e8b37c21</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-09-14T17:46:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do the hadrian rebuild multicore
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/07762eb5cfe735e131a7f017939a6b0ccfb28389">07762eb5</a></strong>
<div>
<span>by Wander Hillen</span>
<i>at 2020-09-14T17:46:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Also cache other hadrian builds
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8610bcbeb11b898f85f228b755fa8421b5ae3e34">8610bcbe</a></strong>
<div>
<span>by DenisFrezzato</span>
<i>at 2020-09-15T15:19:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix rtsopts documentation
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c7182a5c67fe8b5bd256cb8eb805562636853ea2">c7182a5c</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-15T15:19:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Care with implicit-parameter superclasses
Two bugs, #18627 and #18649, had the same cause: we were not
account for the fact that a constaint tuple might hide an implicit
parameter.
The solution is not hard: look for implicit parameters in
superclasses. See Note [Local implicit parameters] in
GHC.Core.Predicate.
Then we use this new function in two places
* The "short-cut solver" in GHC.Tc.Solver.Interact.shortCutSolver
which simply didn't handle implicit parameters properly at all.
This fixes #18627
* The specialiser, which should not specialise on implicit parameters
This fixes #18649
There are some lingering worries (see Note [Local implicit
parameters]) but things are much better.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0f3884b0b72fb1e4641450e68f63580c0e86f515">0f3884b0</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-09-15T15:20:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Export enrichHie from GHC.Iface.Ext.Ast
This is useful for `ghcide`
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b3143f5a0827b640840ef241a30933dc23b69d91">b3143f5a</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-15T15:21:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enhance metrics output
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4283feaa9e0826211f7a71d543054c989ea32965">4283feaa</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-15T15:21:43-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Introduce and use DerivClauseTys (#18662)
This switches `deriv_clause_tys` so that instead of using a list of
`LHsSigType`s to represent the types in a `deriving` clause, it now
uses a sum type. `DctSingle` represents a `deriving` clause with no
enclosing parentheses, while `DctMulti` represents a clause with
enclosing parentheses. This makes pretty-printing easier and avoids
confusion between `HsParTy` and the enclosing parentheses in
`deriving` clauses, which are different semantically.
Fixes #18662.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/90229c4b781184d0e59ac67afda90ed316f62bcd">90229c4b</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-09-16T04:53:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Include -f{write,validate}-ide-info in the User's Guide flag reference
Previously, these were omitted from the flag reference due to a
layout oversight in `docs/users_guide/flags.{rst,py}`.
Fixes #18426.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ce42e187ebfc81174ed477f247f023ae094c9b24">ce42e187</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-16T04:53:59-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">rts: Fix erroneous usage of vsnprintf
As pointed out in #18685, this should be snprintf not vsnprintf. This
appears to be due to a cut-and-paste error.
Fixes #18658.
</pre>
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<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b695e7d73617ab19170d37b383315e8ede289c5e">b695e7d7</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-16T04:54:38-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rename ghci flag into internal-interpreter
"ghci" as a flag name was confusing because it really enables the
internal-interpreter. Even the ghci library had a "ghci" flag...
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8af954d202de1de0671062c3f55e43fc783f8192">8af954d2</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-16T04:55:17-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make ghc-boot reexport modules from ghc-boot-th
Packages don't have to import both ghc-boot and ghc-boot-th. It makes
the dependency graph easier to understand and to refactor.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/95c8e9fc4599140cfaac760d28150320d94f679e">95c8e9fc</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-16T17:15:34+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Implement Quick Look impredicativity
This patch implements Quick Look impredicativity (#18126), sticking
very closely to the design in
A quick look at impredicativity, Serrano et al, ICFP 2020
The main change is that a big chunk of GHC.Tc.Gen.Expr has been
extracted to two new modules
GHC.Tc.Gen.App
GHC.Tc.Gen.Head
which deal with typechecking n-ary applications, and the head of
such applications, respectively. Both contain a good deal of
documentation.
Three other loosely-related changes are in this patch:
* I implemented (partly by accident) points (2,3)) of the accepted GHC
proposal "Clean up printing of foralls", namely
https://github.com/ghc-proposals/ghc-proposals/blob/
master/proposals/0179-printing-foralls.rst
(see #16320).
In particular, see Note [TcRnExprMode] in GHC.Tc.Module
- :type instantiates /inferred/, but not /specified/, quantifiers
- :type +d instantiates /all/ quantifiers
- :type +v is killed off
That completes the implementation of the proposal,
since point (1) was done in
commit df08468113ab46832b7ac0a7311b608d1b418c4d
Author: Krzysztof Gogolewski <krzysztof.gogolewski@tweag.io>
Date: Mon Feb 3 21:17:11 2020 +0100
Always display inferred variables using braces
* HsRecFld (which the renamer introduces for record field selectors),
is now preserved by the typechecker, rather than being rewritten
back to HsVar. This is more uniform, and turned out to be more
convenient in the new scheme of things.
* The GHCi debugger uses a non-standard unification that allows the
unification variables to unify with polytypes. We used to hack
this by using ImpredicativeTypes, but that doesn't work anymore
so I introduces RuntimeUnkTv. See Note [RuntimeUnkTv] in
GHC.Runtime.Heap.Inspect
WARNING: this patch won't validate on its own. It was too
hard to fully disentangle it from the following patch, on
type errors and kind generalisation.
Changes to tests
* Fixes #9730 (test added)
* Fixes #7026 (test added)
* Fixes most of #8808, except function `g2'` which uses a
section (which doesn't play with QL yet -- see #18126)
Test added
* Fixes #1330. NB Church1.hs subsumes Church2.hs, which is now deleted
* Fixes #17332 (test added)
* Fixes #4295
* This patch makes typecheck/should_run/T7861 fail.
But that turns out to be a pre-existing bug: #18467.
So I have just made T7861 into expect_broken(18467)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f4f408660b2c344e700ed5fc9beb685395924a76">f4f40866</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-16T17:15:57+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve kind generalisation, error messages
This patch does two things:
* It refactors GHC.Tc.Errors a bit. In debugging Quick Look I was
forced to look in detail at error messages, and ended up doing a bit
of refactoring, esp in mkTyVarEqErr'. It's still quite a mess, but
a bit better, I think.
* It makes a significant improvement to the kind checking of type and
class declarations. Specifically, we now ensure that if kind
checking fails with an unsolved constraint, all the skolems are in
scope. That wasn't the case before, which led to some obscure error
messages; and occasional failures with "no skolem info" (eg #16245).
Both of these, and the main Quick Look patch itself, affect a /lot/ of
error messages, as you can see from the number of files changed. I've
checked them all; I think they are as good or better than before.
Smaller things
* I documented the various instances of VarBndr better.
See Note [The VarBndr tyep and its uses] in GHC.Types.Var
* Renamed GHC.Tc.Solver.simpl_top to simplifyTopWanteds
* A bit of refactoring in bindExplicitTKTele, to avoid the
footwork with Either. Simpler now.
* Move promoteTyVar from GHC.Tc.Solver to GHC.Tc.Utils.TcMType
Fixes #16245 (comment 211369), memorialised as
typecheck/polykinds/T16245a
Also fixes the three bugs in #18640
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b706077bc7b82a71c1c6d003a3946c08f517450">5b706077</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-16T17:15:57+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use UniqSet for FieldLabelString instead of Data.Set
FieldLabelString, which is a FastString, no longer has an Ord instance.
</pre>
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.gitlab-ci.yml
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compiler/GHC/Core/Opt/Specialise.hs
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compiler/GHC/Core/Predicate.hs
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compiler/GHC/Core/TyCon.hs
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compiler/GHC/Hs/Decls.hs
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compiler/GHC/Hs/Extension.hs
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