#12730: Pattern synonym signature fails with unlifted type -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{#!hs pattern P2# a b = (# a, b #) }}} works but adding a type signture makes it fail {{{#!hs -- tp0w.hs:130:25-34: error: … -- • Expecting a lifted type, but ‘(# a, b #)’ is unlifted -- • In the type ‘(# a, b #)’ -- Compilation failed. pattern P2# :: a -> b -> (# a, b #) pattern P2# a b = (# a, b #) }}} Same with these {{{#!hs pattern True :: Int# pattern True = 1# pattern False :: Int# pattern False = 0# }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12730 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler