#13908: sameMutableArray equivalent for Array -------------------------------------+------------------------------------- Reporter: winter | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.0.1 Resolution: wontfix | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D3697 Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Actually, in its current form I realized that `reallyUnsafePtrEquality#` doesn't really fit the bill: it's type is `Type -> Type -> Int#` whereas `ByteArray#` is of kind `TYPE 'UnliftedPtrRep`. This means that you would first need to coerce the `ByteArray#` to a lifted type before being able to do the comparison, which seems quite ugly. Ideally we would be able to make the type of `reallyUnsafePtrEquality#` `TYPE ('PtrRep levity) -> TYPE ('PtrRep levity) -> Int#`, abstracting over levity. In the short term we could also introduce a `reallyUnsafeUnliftedPtrEquality# :: TYPE 'UnliftedPtrRep -> TYPE 'UnliftedPtrRep -> Int#`, but frankly I think the `unsafeCoerce#` is probably a reasonable 80% solution for the time being. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13908#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler