#11274: Confused type checker with typed holes and a missing instance (also panic) -------------------------------------+------------------------------------- Reporter: Xandaros | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Compile-time | Test Case: crash | typecheck/should_fail/T11274 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * testcase: => typecheck/should_fail/T11274 * status: new => closed * resolution: => fixed Comment: This works in HEAD (and hence 8.0), but I've added a regression test. We rightly get {{{ T11274.hs:10:25: error: • No instance for (Eq Asd) arising from a use of ‘==’ • In the expression: x == y In an equation for ‘missingInstance’: missingInstance x y = x == y }}} I have not tested 7.10.3, but I assume you are right about it failing there. Honestly, even if we release 7.10.4 I doubt we'll fix this bug on that branch -- it's not a show-stopper, and it'd be fresh work to do so. So I'll close this as fixed. Thanks for reporting such a nice small case! Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11274#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler