#15557: Reduce type families in equations' RHS when testing equation compatibility -------------------------------------+------------------------------------- Reporter: mniip | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler (Type | Version: 8.4.3 checker) | Resolution: | Keywords: TypeFamilies Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: #8423 #15546 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by mniip): Yes, of course, being unable to unify `a ~ Test a a` is a more "severe" way to put it, but the fact that it doesn't reduce in `:t` is a more quick test. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15557#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler