#13027: The let/app invariant, evaluated-ness, and reallyUnsafePtrEquality# -------------------------------------+------------------------------------- Reporter: erikd | Owner: dfeuer Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Building GHC | Test Case: failed | simplCore/should_compile/T13027 Blocked By: | Blocking: Related Tickets: #11444 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * cc: simonmar (added) Comment: Yes, but they really do have side effects. It matters when they are executed, and it matters if they are not executed at all. That said, I doubt it would matter if the (badly named) `seq#` also had these attributes. I wish I could think of an obviously-correct way to reason about this, rather than simply not being able to see a problem. Simon Marlow may be able to help. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13027#comment:35 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler