#14626: No need to enter a scrutinised value -------------------------------------+------------------------------------- Reporter: heisenbug | Owner: heisenbug Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Resolution: | Keywords: performance Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #13861 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by alexbiehl): An `STRef` is a wrapper around `MutVar#` which is has `UnliftedRep` (represented through a pointer, never bottom) thus it doesn't need a tag to note its evaluatedness. GHC probably only tags value with `LiftedRep`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14626#comment:29 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler