[GHC] #13426: compile-time memory-usage regression for DynFlags between GHC 8.0 and GHC 8.2

[GHC]

#13426: compile-time memory-usage regression for DynFlags between GHC 8.0 and GHC
8.2
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        Reporter:  hvr               |                Owner:  rwbarton
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3399,
       Wiki Page:                    |  Phab:D3400
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"29645274a3c97a904759aa245dc8f8c03a58c601/ghc" 2964527/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="29645274a3c97a904759aa245dc8f8c03a58c601"
 Refactor simplExpr (Type ty)

 This small refactoring, provoked by comment:18 on Trac #13426,
 makes it so that simplExprF never gets a (Type ty) expression to
 simplify, which in turn means that calls to exprType on its argument
 will always succeed.

 No change in behaviour.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13426#comment:20>
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