#12718: Segmentation fault, runtime representation polymorphism -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: GHCi crash | Test Case: Blocked By: | Blocking: Related Tickets: #12779 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by osa1): rwbarton pointed out in #12779 that argument of `isTrue#` should be `0#` or `1#`. The documentation also says the same thing in different words: {{{#!haskell {-# INLINE isTrue# #-} -- | Alias for 'tagToEnum#'. Returns True if its parameter is 1# and False -- if it is 0#. isTrue# :: Int# -> Bool -- See Note [Optimizing isTrue#] isTrue# x = tagToEnum# x }}} So maybe this is expected and we can close this ticket and #12779. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12718#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler