So if we do a binder swap, we should do it for all the variables the scrutinee is strict
This is a bridge too far! Strictness analysis will work this out, I
#15226: GHC doesn't know that seq# produces something in WHNF -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: merge Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D4796 Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): Replying to [comment:14 simonpj]: think. Eg that `let e` will turn into a case. I don't think so. `seq#` is intentionally lazy in its argument, to allow explicit ordering in an `IO` context. This seems pretty important in combination with `spark#`, for example. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15226#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler