#12150: Compile time performance degradation on code that uses undefined/error with CallStacks -------------------------------------+------------------------------------- Reporter: thomie | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.2.2 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #10844 | Differential Rev(s): Phab:D3753 Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): What we're doing here smells an awful lot like what we're doing in the case-of-known-constructor transformation in `rebuildCase`. Rather than a known constructor, we're dealing with a known bottom. Would it make sense to move the bottom check there, or is that nonsense? I don't have a great sense of how all these pieces fit together yet. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12150#comment:21 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler