Re: [GHC] #15767: "StgCmmEnv: variable not found" with FunctionalDependencies and FlexibleContexts

#15767: "StgCmmEnv: variable not found" with FunctionalDependencies and FlexibleContexts -------------------------------------+------------------------------------- Reporter: roland | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.6.1 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 ): In [changeset:"6b1102e2cfcffb265fd33cf8a99ab5e6b3f14906/ghc" 6b1102e2/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="6b1102e2cfcffb265fd33cf8a99ab5e6b3f14906" Report a Wanted error even if there are Given ones We suppress some Given errors; see Note [Given errors] in TcErrors. But we must be careful not to suppress Wanted errors because of the presence of these Given errors -- else we might allow compilation to bogusly proceed The rubber hits the road in TcRnTypes.insolubleCt, where we don't want to treat Givens as insoluble, nor (and this is the new bit) Deriveds that arise from Givens. See Note [Given insolubles] in TcRnTypes. This fixes #15767. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15767#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler