Re: [GHC] #12220: TypeApplications and DefaultSignatures - problems deducing type variables.

#12220: TypeApplications and DefaultSignatures - problems deducing type variables. -------------------------------------+------------------------------------- Reporter: mkloczko | Owner: Type: bug | Status: closed Priority: normal | Milestone: 8.0.2 Component: Compiler | Version: 8.0.1 Resolution: fixed | Keywords: | DefaultSignatures, TypeApplications Operating System: Linux | Architecture: x86_64 | (amd64) Type of failure: None/Unknown | Test Case: | generics/T12220 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ryan Scott ): In [changeset:"2e8463b232054b788b73e6551947a9434aa76009/ghc" 2e8463b2/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="2e8463b232054b788b73e6551947a9434aa76009" Update 8.0.2 release notes for #12784 Summary: The fix for #12220 exposed some ill-typed programs which passed the typechecker in GHC 8.0.1 but now fail to typecheck in GHC 8.0.2. It's a bit difficult to characterize what exactly triggers this bug, but we at least have a minimal example and a simple fix to illustrate the problem and solution, so let's add that the the 8.0.2 release notes to advertise this change. Resolves #12784. Reviewers: rwbarton, austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2682 GHC Trac Issues: #12784 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12220#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler