#15019: Fix performance regressions from #14737 -------------------------------------+------------------------------------- Reporter: tdammers | Owner: tdammers Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #14737 | Differential Rev(s): phab:D4568 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Ah, much easier to understand. Now my next question is this: who built that coercion? It is actually reflexive, and it's trivial to see that; but it is not `ReflCo`. Usually we build coercions with smart constructors that rapidly smash to `ReflCo`. Can you describe how to reproduce this exact example? I can't get it to trip on `T9020` and `T12707` seems much larger. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15019#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler