#13381: "opt_univ fell into a hole" panic from rewrite rule -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Simon Peyton Jones <simonpj@…>): In [changeset:"af6ed4a62c77e57f544243aa72bba51a1cff6808/ghc" af6ed4a6/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="af6ed4a62c77e57f544243aa72bba51a1cff6808" Fix constraint simplification in rules Trac #13381 showed that we were losing track of a wanted constraint when simplifying the LHS constraints for a RULE. This patch fixes it, makes the code a bit simpler, and better documented. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13381#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler