#14998: Sort out the strictness mess for exceptions -------------------------------------+------------------------------------- Reporter: simonpj | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.4.3 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: Exceptions Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by sgraf): Ah, `-ddump-prep` revealed that the non-trivial argument to `catch#` on non-HEAD was turned into a one-shot PAP `sat = act h`, which allocates. Of course! That's probably where the alleged benefit of item 3 came from. Indeed `reverse-complement` and `spheres` where the biggest beneficiaries, judging from the commit message. So, we need to be strict in `act h` because otherwise it will turn into a lazy let that allocates. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14998#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler