#13426: compile-time memory-usage regression for DynFlags between GHC 8.0 and GHC 8.2 -------------------------------------+------------------------------------- Reporter: hvr | Owner: rwbarton Type: bug | Status: new Priority: high | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Well done! Yes, use `simplType`! Can you add a Note to `simplType` explaining why it is so important to use it rather than naked `substTy` calls; and pointing to this ticket? I suspect that it has been a problem for a long time; just that no one has noticed. It's very uncomfortable that this is so delicate; and even when recognised is so hard to find. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13426#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler