#9792: map/coerce rule never seems to fire -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: ekmett Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Core | Version: 7.9 Libraries | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: Runtime | Related Tickets: performance bug | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by nomeata):
But I thought Coercible evidence is never ⊥... unless you're thinking about deferred type errors?
It can be ⊥, just write `coerceWith undefined` using Data.Type.Coercion. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9792#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler