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<h3>
Simon Peyton Jones pushed to branch wip/T17173
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/85fc32f03a6df92ec8d4ec9accca3c11b31a1596">85fc32f0</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-04-17T12:45:25-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Hadrian: fix dyn_o/dyn_hi rule (#17534)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bfde3b76ac7f5a72eca012fe34ac1340a5ce2011">bfde3b76</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2020-04-17T12:46:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #18065 by fixing an InstCo oversight in Core Lint
There was a small thinko in Core Lint's treatment of `InstCo`
coercions that ultimately led to #18065. The fix: add an apostrophe.
That's it!
Fixes #18065.
Co-authored-by: Simon Peyton Jones <simonpj@microsoft.com>
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a05348ebaa11d563ab2e33325055317ff3cb8afc">a05348eb</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-04-17T13:08:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Change the fail operator argument of BindStmt to be a Maybe
Don't use noSyntaxExpr for it. There is no good way to defensively case
on that, nor is it clear one ought to do so.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/79e27144db7011f6d01a2f5ed15fd110d579bb8e">79e27144</a></strong>
<div>
<span>by John Ericson</span>
<i>at 2020-04-17T13:08:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use trees that grow for rebindable operators for `<-` binds
Also add more documentation.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/18bc16ed78dfa1fe9498c5ac1ca38e9f84267872">18bc16ed</a></strong>
<div>
<span>by Cale Gibbard</span>
<i>at 2020-04-17T13:08:47-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Use FailOperator in more places, define a couple datatypes (XBindStmtRn and XBindStmtTc) to help clarify the meaning of XBindStmt in the renamer and typechecker
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/84cc8394d075cea236faa0bcd9ef0a84de89ee8c">84cc8394</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-18T13:20:29-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a missing zonk in tcHsPartialType
I omitted a vital zonk when refactoring tcHsPartialType in
commit 48fb3482f8cbc8a4b37161021e846105f980eed4
Author: Simon Peyton Jones <simonpj@microsoft.com>
Date: Wed Jun 5 08:55:17 2019 +0100
Fix typechecking of partial type signatures
This patch fixes it and adds commentary to explain why.
Fixes #18008
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2ee96ac1aa2cbff4e70bc45988930d64599029f2">2ee96ac1</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Bump FreeBSD bootstrap compiler to 8.10.1
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/434312e5fdde91d6ad7b6d199bbb560a72ab6b89">434312e5</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Enable FreeBSD job for so-labelled MRs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/ddffb2278a22b7c0e3a9fce11ada67a471243409">ddffb227</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Use rules syntax for conditional jobs
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e2586828a30202a28dcacac9ab7fc83c43da9e02">e2586828</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-04-18T13:21:05-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bump hsc2hs submodule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/15ab6cd548f284732a7f89d78c2b89b1bfc4ea1d">15ab6cd5</a></strong>
<div>
<span>by Ömer Sinan Ağacan</span>
<i>at 2020-04-18T13:21:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Improve prepForeignCall error reporting
Show parameters and description of the error code when ffi_prep_cif
fails.
This may be helpful for debugging #17018.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/34287d9a676b83a50e15acecbe0be2e7232f1987">34287d9a</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-04-18T22:53:29+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Do eager instantation in terms
This patch implements eager instantiation, a small but critical change
to the type inference engine, #17173. The main change is this:
When inferring types, always return an instantiated type
(for now, deeply instantiated; in future shallowly instantiated)
There is more discussion in
https://www.tweag.io/posts/2020-04-02-lazy-eager-instantiation.html
There is quite a bit of refactoring in this patch:
* The ir_inst field of GHC.Tc.Utils.TcType.InferResultk
has entirely gone. So tcInferInst and tcInferNoInst have collapsed
into tcInfer.
* Type inference of applications, via tcInferApp and
tcInferAppHead, are substantially refactored, preparing
the way for Quick Look impredicativity.
* New pure function GHC.Tc.Gen.Expr.collectHsArgs and applyHsArgs
are beatifully dual. We can see the zipper!
* GHC.Tc.Gen.Expr.tcArgs is now much nicer; no longer needs to return
a wrapper
* In HsExpr, HsTypeApp now contains the the actual type argument,
and is used in desugaring, rather than putting it in a mysterious
wrapper.
* I struggled a bit with good error reporting in
Unify.matchActualFunTysPart. It's a little bit simpler than before,
but still not great.
Some smaller things
* Rename tcPolyExpr --> tcCheckExpr
tcMonoExpr --> tcLExpr
* tcPatSig moves from GHC.Tc.Gen.HsType to GHC.Tc.Gen.Pat
Metric Decrease:
T9961
Reduction of 1.6% in comiler allocation on T9961, I think.
</pre>
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<h4>30 changed files:</h4>
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.gitlab-ci.yml
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<a href="#157f7634c25bc6366cb7c9c9edb48e819dce38db">
.gitlab/ci.sh
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<a href="#36a42448a83a9d1f6df8475f03ead2eed199dd8e">
compiler/GHC/Core/Lint.hs
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<a href="#cc97d81e7223ad4a3a5e801156ca632f9fa75654">
compiler/GHC/Hs/Expr.hs
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<a href="#9f00edfedb0f969865b049a78de3866545b4a60b">
compiler/GHC/Hs/Instances.hs
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<a href="#7a1af22e4c32b9aa6ec708d9d3788e1c4db5da9a">
compiler/GHC/Hs/Utils.hs
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<a href="#5855ff1d64fcadf28e7984964e69e35ff4de7f0a">
compiler/GHC/HsToCore/Arrows.hs
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<a href="#e011edcbdb6414ff00022ab5c1eeee88906a53ab">
compiler/GHC/HsToCore/Coverage.hs
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compiler/GHC/HsToCore/Expr.hs
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<a href="#0f81db91b67c3e47ac75aa942ac3aa080f676036">
compiler/GHC/HsToCore/Expr.hs-boot
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compiler/GHC/HsToCore/GuardedRHSs.hs
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compiler/GHC/HsToCore/ListComp.hs
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<a href="#ac0a6473a902628a18b3a470122e5cc1ce09de14">
compiler/GHC/HsToCore/PmCheck.hs
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compiler/GHC/HsToCore/Quote.hs
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compiler/GHC/Iface/Ext/Ast.hs
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<a href="#b47ece2bbb8303a5792c2fdc52394c8ed336e8a2">
compiler/GHC/Rename/Expr.hs
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compiler/GHC/Rename/Splice.hs
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<a href="#3aa56839e36b2219f9ad54f5646ef3005da9c672">
compiler/GHC/Tc/Deriv/Generate.hs
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<a href="#71fa5eb3ba70e1d3a6181a226c2c227d42f1eb7d">
compiler/GHC/Tc/Gen/Arrow.hs
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<a href="#83f745d921da7adb739e81f83e1c07e723e4a789">
compiler/GHC/Tc/Gen/Bind.hs
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<a href="#902811828741e6bcd64702935bbb54edbbd070ef">
compiler/GHC/Tc/Gen/Expr.hs
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compiler/GHC/Tc/Gen/Expr.hs-boot
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<a href="#08a3d553a8ca7a753d77697815b63cd85e7dfbd6">
compiler/GHC/Tc/Gen/Foreign.hs
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compiler/GHC/Tc/Gen/HsType.hs
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compiler/GHC/Tc/Gen/Match.hs
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compiler/GHC/Tc/Gen/Pat.hs
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<a href="#04338da99bccd89402218ca19c5724762f0fe641">
compiler/GHC/Tc/Gen/Rule.hs
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<a href="#9ea832ccdb4b5f7508a1efd6caedeafa16b269e7">
compiler/GHC/Tc/Gen/Splice.hs
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<a href="#e65390fa5a32c453a81a1c9a3e1c4464d155ca4a">
compiler/GHC/Tc/Module.hs
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compiler/GHC/Tc/TyCl/PatSyn.hs
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<h5>The diff was not included because it is too large.</h5>
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