Re: [GHC] #13394: PatternSynonyms/OverloadedStrings regression in GHC HEAD

#13394: PatternSynonyms/OverloadedStrings regression in GHC HEAD -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: | PatternSynonyms Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Simon Peyton Jones ): In [changeset:"8e053700f9357c1b9030c406130062795ae5015c/ghc" 8e05370/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="8e053700f9357c1b9030c406130062795ae5015c" Join points can be levity-polymorphic It's ok to have a levity-polymorphic join point, thus let j :: r :: TYPE l = blah in ... Usually we don't allow levity-polymorphic binders, but join points are different because they are not first class. I updated the invariants in CoreSyn. This commit fixes Trac #13394. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13394#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler