#11464: Type casts cause confusing error -------------------------------------+------------------------------------- Reporter: simonpj | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Simon Peyton Jones <simonpj@…>): In [changeset:"b2e6350fb23403f1c88c5cfed5270d78dbdb6573/ghc" b2e6350/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="b2e6350fb23403f1c88c5cfed5270d78dbdb6573" Strip casts in checkValidInstHead This patch addresses Trac #11464. The fix is a bit crude (traverse the type to remove CastTys), but it's also simple. See Note [Casts during validity checking] in TcValidity }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11464#comment:1> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler