#11444: 8.0 rc1 panics in applyTypeToArgs -------------------------------------+------------------------------------- Reporter: osa1 | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.0.1-rc1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #13027 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): Sorry; that last comment was unclear. If we have {{{#!hs case x of x' { _ -> case y of y' { _ -> case reallyUnsafePtrEquality# x' y' of {....}}} }}} and we substitute as above, {{{#!hs case x of x' { _ -> case y of y' { _ -> case reallyUnsafePtrEquality# x y of {....}}} }}} then wouldn't floating out lead to this? {{{#!hs let wrong = reallyUnsafePtrEquality# x y in { case x of x' { _ -> case y of y' { _ -> case wrong of { ... }}}} }}} Now the pointer equality test could be performed ''before'' the reductions that would make it much more precise! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11444#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler