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<h3>
Danya Rogozin pushed to branch wip/ghc-18740-lookup-update
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/04d6433158d95658684cf419c4ba5725d2aa539e">04d64331</a></strong>
<div>
<span>by syd@cs-syd.eu</span>
<i>at 2020-09-24T13:15:54-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update Lock.hs with more documentation to make sure that the Boolean return value is clear.
[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/97cff9190d346c3b51c32c88fd145fcf1e6678f1">97cff919</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-24T13:16:32-04:00</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
Updates haddock submodule.
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/9fa26aa16f9eee0b56b5d9e65c16367d7b789996">9fa26aa1</a></strong>
<div>
<span>by Simon Peyton Jones</span>
<i>at 2020-09-24T13:16:32-04:00</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/6d0ce0eb772bf69c57e14f30c16c606ab5035816">6d0ce0eb</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-24T13:17:07-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Desugar string literal patterns with -XRebindableSyntax correctly (#18708)
Fixes #18708.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/007940d2fa1ac4f8046989d4af1d088914612a78">007940d2</a></strong>
<div>
<span>by Hécate</span>
<i>at 2020-09-24T13:17:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Namespace the Hadrian linting rule for base
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b72718953c289b6827e877e14d9f0f3f5c64267">5b727189</a></strong>
<div>
<span>by Andreas Klebinger</span>
<i>at 2020-09-25T21:10:20-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make sizeExpr strict in the size threshold to facilitate WW.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/dd6640316865d84075b00013b8b97076705e5c44">dd664031</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-25T21:10:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ci.sh: Factor out common utilities
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/5b78e8658c3f5042967cbe9d30a5a630946c4fd7">5b78e865</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-25T21:10:56-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ci: Add ad-hoc performance testing rule
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/29885f076219d878d2c976e78b7960a1a5938a96">29885f07</a></strong>
<div>
<span>by Zubin Duggal</span>
<i>at 2020-09-25T21:11:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Stop removing definitions of record fields in GHC.Iface.Ext.Ast
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/0d6519d9e8604d067f4a4f760e4bc3403727a498">0d6519d9</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2020-09-25T21:12:08-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">gitlab-ci: Drop Darwin cleanup job
We now have a proper periodic clean-up script installed on the runners.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/277d20af1ce54c7e2c76dfe3b96c54babceeea41">277d20af</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-25T21:12:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add regression tests for #18371
They have been fixed by !3959, I believe.
Fixes #18371.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/8edf60562720b91613a6ad6b949ae08416f81c9a">8edf6056</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-25T21:12:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a regression test for #18609
The egregious performance hits are gone since !4050.
So we fix #18609.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4a1b89a40d553213c9722207608a07f8a4c07545">4a1b89a4</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-25T21:12:44-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Accept new test output for #17218
The expected test output was plain wrong.
It has been fixed for a long time.
Thus we can close #17218.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/516062366ed1957e499f27dfc6b685a073a18400">51606236</a></strong>
<div>
<span>by Sven Tennie</span>
<i>at 2020-09-25T21:13:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Print RET_BIG stack closures
A RET_BIG closure has a large bitmap that describes it's payload and can
be printed with printLargeBitmap().
Additionally, the output for payload closures of small and big bitmaps is
changed: printObj() is used to print a bit more information about what's
on the stack.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2707c4eae4cf99e6da2709e128f560d91e468357">2707c4ea</a></strong>
<div>
<span>by Arnaud Spiwack</span>
<i>at 2020-09-25T21:13:58-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Pattern guards BindStmt always use multiplicity Many
Fixes #18439 .
The rhs of the pattern guard was consumed with multiplicity one, while
the pattern assumed it was Many. We use Many everywhere instead.
This is behaviour consistent with that of `case` expression. See #18738.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/92daad241bf136a10346ecbf520d62921c82bf7d">92daad24</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-25T21:14:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: refactor backend modules
* move backends into GHC.Num.Backend.*
* split backend selection into GHC.Num.Backend and
GHC.Num.Backend.Selected to avoid duplication with the Check backend
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/04bc50b3c8e40387a0d0f090ea23cd68923f1834">04bc50b3</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-25T21:14:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: implement extended GCD (#18427)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/6a7dae4badcea5b3519005cf4e5fbf15f7e5df59">6a7dae4b</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-25T21:15:14-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix typed holes causing linearity errors (#18491)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/83407ffc7acc00cc025b9f6ed063add9ab9f9bcc">83407ffc</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-25T21:15:53-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Various documentation fixes
* Remove UnliftedFFITypes from conf. Some time ago, this extension
was undocumented and we had to silence a warning.
This is no longer needed.
* Use r'' in conf.py. This fixes a Sphinx warning:
WARNING: Support for evaluating Python 2 syntax is deprecated and will be removed in Sphinx 4.0. Convert docs/users_guide/conf.py to Python 3 syntax.
* Mark GHCForeignImportPrim as documented
* Fix formatting in template_haskell.rst
* Remove 'recursive do' from the list of unsupported items in TH
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/af1e84e794591e09e20c661fa1d3df59f5b56e4a">af1e84e7</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-26T05:36:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">PmCheck: Big refactor of module structure
* Move everything from `GHC.HsToCore.PmCheck.*` to
`GHC.HsToCore.Pmc.*` in analogy to `GHC.Tc`, rename exported
`covCheck*` functions to `pmc*`
* Rename `Pmc.Oracle` to `Pmc.Solver`
* Split off the LYG desugaring and checking steps into their own
modules (`Pmc.Desugar` and `Pmc.Check` respectively)
* Split off a `Pmc.Utils` module with stuff shared by
`Pmc.{,Desugar,Check,Solver}`
* Move `Pmc.Types` to `Pmc.Solver.Types`, add a new `Pmc.Types` module
with all the LYG types, which form the interfaces between
`Pmc.{Desugar,Check,Solver,}`.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/f08f98e821bc4b755a7b6ad3bad39ce1099c5405">f08f98e8</a></strong>
<div>
<span>by Sebastian Graf</span>
<i>at 2020-09-26T05:36:46-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Extract SharedIdEnv into its own module
It's now named `GHC.Types.Unique.SDFM.UniqSDFM`.
The implementation is more clear about its stated goals and supported
operations.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/1cde295c543e209c3b81256b50e77f3c5132a4ad">1cde295c</a></strong>
<div>
<span>by Sylvain Henry</span>
<i>at 2020-09-26T05:37:23-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Bignum: add bigNatFromWordArray
Reimplementation of integer-gmp's byteArrayToBigNat#
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/bda55fa0444310079ab89f2d28ddb8982975b646">bda55fa0</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-26T13:18:22-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Make 'undefined x' linear in 'x' (#18731)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/160fba4aa306c0649c72a6dcd7c98d9782a0e74b">160fba4a</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-26T13:19:00-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disallow linear types in FFI (#18472)
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/e124f2a7d9a5932a4c2383fd3f9dd772b2059885">e124f2a7</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-26T13:19:36-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix handling of function coercions (#18747)
This was broken when we added multiplicity to the function type.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/7ff433824ea4d265fca09de9c26f3fd77a34bb22">7ff43382</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-27T03:01:31+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Comments: change outdated reference to mergeOps
As of 686e06c59c3aa6b66895e8a501c7afb019b09e36,
GHC.Parser.PostProcess.mergeOps no longer exists.
[ci skip]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/4edf5527dbdd9781260e8822cb11a3f758fc7e91">4edf5527</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-27T10:04:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Don't rearrange (->) in the renamer
The parser produces an AST where the (->)
is already associated correctly:
1. (->) has the least possible precedence
2. (->) is right-associative
Thus we don't need to handle it in mkHsOpTyRn.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a9ce159ba58ca7e8946b46e19b1361588b677a26">a9ce159b</a></strong>
<div>
<span>by Vladislav Zavialov</span>
<i>at 2020-09-27T10:04:12-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Remove outdated comment in rnHsTyKi
This comment dates back to 3df40b7b78044206bbcffe3e2c0a57d901baf5e8
and does not seem relevant anymore.
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c296909dd9b246a6fa6de70b3ab1a6f07739184">2c296909</a></strong>
<div>
<span>by Daniel Rogozin</span>
<i>at 2020-09-28T18:44:50+03:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fall back to types when looking up data constructors (#18740)
Before this patch, referring to a data constructor in a term-level
context led to a scoping error:
ghci> id Int
<interactive>:1:4: error: Data constructor not in scope: Int
After this patch, the renamer falls back to the type namespace
and successfully finds the Int. It is then rejected in the type
checker with a more useful error message:
<interactive>:1:4: error:
Type constructor 'Int' used where a value identifier was expected
We also do this for type variables.
</pre>
</li>
</ul>
<h4>24 changed files:</h4>
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<a href="#587d266bb27a4dc3022bbed44dfa19849df3044c">
.gitlab-ci.yml
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<a href="#157f7634c25bc6366cb7c9c9edb48e819dce38db">
.gitlab/ci.sh
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.gitlab/common.sh
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<a href="#783e5dae6e86931f06700fc088fb7d48c8a07386">
compiler/GHC/Core/Coercion.hs
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compiler/GHC/Core/TyCon.hs
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compiler/GHC/Core/Unfold.hs
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compiler/GHC/Hs/Decls.hs
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compiler/GHC/Hs/Expr.hs
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compiler/GHC/Hs/Extension.hs
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compiler/GHC/Hs/Pat.hs
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compiler/GHC/Hs/Type.hs
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compiler/GHC/HsToCore/Binds.hs
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compiler/GHC/HsToCore/Coverage.hs
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compiler/GHC/HsToCore/Expr.hs
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compiler/GHC/HsToCore/GuardedRHSs.hs
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compiler/GHC/HsToCore/Match.hs
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compiler/GHC/HsToCore/Monad.hs
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compiler/GHC/HsToCore/PmCheck.hs
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compiler/GHC/HsToCore/Pmc.hs
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<a href="#3050d0d7e4a9e93aebcc1fe0bed898ca6dac5502">
<span class="new-file">
+
compiler/GHC/HsToCore/Pmc/Check.hs
</span>
</a>
</li>
<li class="file-stats">
<a href="#950eaa7de202a2e915b5ff68a4cfd16e972ad359">
<span class="new-file">
+
compiler/GHC/HsToCore/Pmc/Desugar.hs
</span>
</a>
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<li class="file-stats">
<a href="#092dafb784a8c4eeb7ab4572ab3ef35308020a00">
compiler/GHC/HsToCore/PmCheck/Ppr.hs
→
compiler/GHC/HsToCore/Pmc/Ppr.hs
</a>
</li>
<li class="file-stats">
<a href="#9095b3c5485a1f2f18a0a43346b7a49dfdd1f65d">
compiler/GHC/HsToCore/PmCheck/Oracle.hs
→
compiler/GHC/HsToCore/Pmc/Solver.hs
</a>
</li>
<li class="file-stats">
<a href="#6983b6dc1a4f225d4e72180ad45d8484d9d32931">
compiler/GHC/HsToCore/PmCheck/Types.hs
→
compiler/GHC/HsToCore/Pmc/Solver/Types.hs
</a>
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<li class="file-stats">
<a href="#0036eccef60579fe5f653a10eeb8bf9869964cf4">
<span class="new-file">
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compiler/GHC/HsToCore/Pmc/Types.hs
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<h5>The diff was not included because it is too large.</h5>
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