#13524: GHC does not preserve order of forall'd vars with TypeApplications -------------------------------------+------------------------------------- Reporter: crockeea | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Resolution: | Keywords: | TypeApplications Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Simon Peyton Jones <simonpj@…>): In [changeset:"0ae72512255ba66ef89bdfeea65a23ea6eb35124/ghc" 0ae72512/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="0ae72512255ba66ef89bdfeea65a23ea6eb35124" Yet more work on TcSimplify.simplifyInfer The proximate cause for this patch is Trac #13482, which pointed out further subtle interactions between - Inferring the most general type of a function - A partial type signature for that function That led me into /further/ changes to the shiny new stuff in TcSimplify.simplifyInfer, decideQuantification, decideMonoTyVars, and related functions. Happily, I was able to make some of it quite a bit simpler, notably the bit about promoting free tyvars. I'm happy with the result. Moreover I fixed Trac #13524 at the same time. Happy days. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13524#comment:12> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler