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<h3>
Ben Gamari pushed to branch wip/T13786
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/a03619a03845bd27a2a97f2885855c817fa96b6e">a03619a0</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2019-06-13T22:43:49Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fail fast in solveLocalEqualities
This patch makes us fail fast in TcSimplify.solveLocalEqualities,
and in TcHsType.tc_hs_sig_type, if there are insoluble constraints.
Previously we ploughed on even if there were insoluble constraints,
leading to a cascade of hard-to-understand type errors. Failing
eagerly is much better; hence a lot of testsuite error message
changes. Eg if we have
f :: [Maybe] -> blah
f xs = e
then trying typecheck 'f x = e' with an utterly bogus type
is just asking for trouble.
I can't quite remember what provoked me to make this change,
but I think the error messages are notably improved, by
removing confusing clutter and focusing on the real error.
(cherry picked from commit 5c1f268e2744fab2d36e64c163858995451d7095)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/5857463c709faebd376d04ea90382ac76335e006">5857463c</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2019-06-13T22:47:54Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16517 by bumping the TcLevel for method sigs
There were actually two bugs fixed here:
1. candidateQTyVarsOfType needs to be careful that it does not
try to zap metavariables from an outer scope as "naughty"
quantification candidates. This commit adds a simple check
to avoid doing so.
2. We weren't bumping the TcLevel in kcHsKindSig, which was used
only for class method sigs. This mistake led to the acceptance
of
class C a where
meth :: forall k. Proxy (a :: k) -> ()
Note that k is *locally* quantified. This patch fixes the
problem by using tcClassSigType, which correctly bumps the
level. It's a bit inefficient because tcClassSigType does other
work, too, but it would be tedious to repeat much of the code
there with only a few changes. This version works well and is
simple.
And, while updating comments, etc., I noticed that tcRnType was
missing a pushTcLevel, leading to #16767, which this patch also
fixes, by bumping the level. In the refactoring here, I also
use solveEqualities. This initially failed ghci/scripts/T15415,
but that was fixed by teaching solveEqualities to respect
-XPartialTypeSignatures.
This patch also cleans up some Notes around error generation that
came up in conversation.
Test case: typecheck/should_fail/T16517, ghci/scripts/T16767
(cherry picked from commit a22e51ea6f7a046c87d57ce30d143eef6abee9ff)
(cherry picked from commit 19ab32c5fb3ebd88927b94acf6b348facc1552a2)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/ce97ca46aa80035ea2c582f2b4613e07dfaecd90">ce97ca46</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-14T21:20:39Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghci: Load static objects in batches
Fixes #13786.
</pre>
</li>
</ul>
<h4>30 changed files:</h4>
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<a href="#47f4bea1d308dee249030e6063d92071b5aac240">
compiler/ghci/Linker.hs
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<a href="#9f8e9eab0dc8b12ae9f92fbb76ddca15c817667a">
compiler/typecheck/TcCanonical.hs
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<a href="#c573dfc3158e7ec41ecc0965becd5f1e6e92a2e6">
compiler/typecheck/TcErrors.hs
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<a href="#350c4076427c611b8f14e875a4ca553041c2b847">
compiler/typecheck/TcHsType.hs
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<a href="#367db94fc37c8c7548dbe545a5302c7a5108e41e">
compiler/typecheck/TcMType.hs
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compiler/typecheck/TcRnDriver.hs
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compiler/typecheck/TcRnTypes.hs
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compiler/typecheck/TcSimplify.hs
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compiler/typecheck/TcTyClsDecls.hs
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<a href="#341fd962c5f2c9fcf8be3dbdaa9a14ee1538af07">
compiler/typecheck/TcType.hs
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testsuite/tests/dependent/should_fail/DepFail1.stderr
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testsuite/tests/ghci/scripts/T15898.stderr
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testsuite/tests/ghci/scripts/T16767.script
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testsuite/tests/ghci/scripts/all.T
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testsuite/tests/indexed-types/should_fail/T13877.stderr
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testsuite/tests/partial-sigs/should_fail/T11976.stderr
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<a href="#7b3fa4219629deca61547940ba980e3b3c31651c">
testsuite/tests/partial-sigs/should_fail/T12634.stderr
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<a href="#ba5c02381b0da2db4623be4ed43702101c3653cb">
testsuite/tests/patsyn/should_fail/T15289.stderr
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<a href="#2decae25fbbeca46eab4f4f54da8d350dd1e9060">
testsuite/tests/polykinds/T12593.stderr
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testsuite/tests/polykinds/T15577.stderr
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testsuite/tests/typecheck/should_fail/T11112.stderr
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testsuite/tests/typecheck/should_fail/T13819.stderr
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<a href="#4e1e6ab56fd4526988234b71e8b75ace2cfe1284">
testsuite/tests/typecheck/should_fail/T14232.stderr
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testsuite/tests/typecheck/should_fail/T16517.hs
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testsuite/tests/typecheck/should_fail/T3540.stderr
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testsuite/tests/typecheck/should_fail/T7778.stderr
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testsuite/tests/typecheck/should_fail/T8806.stderr
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testsuite/tests/typecheck/should_fail/VtaFail.stderr
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