#11224: Program doesn't preserve semantics after pattern synonym inlining. -------------------------------------+------------------------------------- Reporter: anton.dubovik | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 Type of failure: Incorrect result | (amd64) at runtime | Test Case: Blocked By: | Blocking: Related Tickets: #11225 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): Oh dear. This example illustrates that I, for one, don't have a grasp on pattern synonym signatures. I had assumed that the universals were precisely those variables mentioned in the result. But that's not true here, because `a` really is a universal, not an existential. So I'm clearly confused. And that sad state of affairs isn't going to be fixed at 11pm at night, so perhaps I'll return to this tomorrow. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11224#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler