[GHC] #11371: Bogus in-scope set in substitutions

[GHC]

#11371: Bogus in-scope set in substitutions
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        Reporter:  simonpj           |                Owner:  niteria
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11360            |  Differential Rev(s):  phab:D1792,
       Wiki Page:                    |  phab:D1801, phab:D1802
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Comment (by Bartosz Nitka <niteria@…>):

 In [changeset:"e5a0a8903715b8717342dabeb72d69b4d5e61e5c/ghc" e5a0a89/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e5a0a8903715b8717342dabeb72d69b4d5e61e5c"
 Suppress substitution assertions to fix tests

 This is one place that I've missed with D1862.
 This doesn't fix the underlying problem and I prefer to suppress it
 now and fix it later as this is a part of a larger effort (#11371)
 to fix an old bug with `substTy` called with invalid `in_scope` sets.

 Test Plan: `make test TEST="hClose002 hClose003 hDuplicateTo001"

 Reviewers: thomie, austin, bgamari, trofi

 Reviewed By: trofi

 Differential Revision: https://phabricator.haskell.org/D1872

 GHC Trac Issues: #11371
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11371#comment:25>
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