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

[GHC]

#11371: Bogus in-scope set in substitutions
-------------------------------------+-------------------------------------
        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
-------------------------------------+-------------------------------------

Comment (by thomie):

 [https://perf.haskell.org/ghc/#revision/dbf72dbc6e49b3db7f2337a7a41e95c1d0169163
 perf.haskell.org] reports for that last commit:
 {{{
 testsuite/unexpected stats      3       + 3     6       tests

 Testsuite allocations

 Benchmark name          previous        change          now
 tests/alloc/T5030       691938256       + 17.33%        811867344
 bytes
 tests/alloc/T9872a      3477263608      + 4.63%         3638155736
 bytes
 tests/alloc/T9872b      4984017672      + 5.75%         5270795992
 bytes
 tests/alloc/T9872c      4507661800      + 6.50%         4800521096
 bytes
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11371#comment:27>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler