#14552: GHC panic on pattern synonym -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.3 Resolution: | Keywords: | PatternSynonyms, TypeInType, | ViewPatterns Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): PS
Interestingly, matcher2 does not type check without this inlining:
It does for me! {{{ matcher3 (T (($ 3) -> x)) k = k x }}} typechecks just fine with inferred type {{{ matcher3 :: forall a t. T -> ((a -> a) -> t) -> t }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14552#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler