#12018: Equality constraint not available in pattern type signature (GADTs/ScopedTypeVariables) -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: lowest | Milestone: Component: Compiler (Type | Version: 7.10.3 checker) | Keywords: GADTs, Resolution: | ScopedTypeVariables 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 goldfire): I frequently find this behavior of GHC frustrating, though I fully understand why it works the way it does (and indeed don't propose a change). Perhaps the way forward is to obviate the need for such signatures by introducing visible type patterns, #11350. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12018#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler