#11161: New exhaustiveness checker breaks concurrent/prog001 -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 7.10.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time Unknown/Multiple | performance bug Test Case: | Blocked By: concurrent/prog001 | Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The new exhaustiveness checker appears to allocate until the machine runs out of memory while compiling the `concurrent/prog001` testcase. In particular it stalls while desugaring the `Thread` module. The fact that this module contains non-trivial pattern matching, coupled with the compiler gets stuck in `Desugar`, and the fact that I've noted other performance issues with the new exhaustiveness checker (see #10711) leads me to believe that this patch is to blame. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11161 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler