#10134: Pattern Matching Causes Infinite Type Error -------------------------------------+------------------------------------- Reporter: dongen | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.4 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by goldfire): `TypeFamilies` without `MonoLocalBinds` is an unsupported configuration. The user manual, section 7.13.9.3 (on let-generalization) concludes with this:
The flag `-XMonoLocalBinds` is implied by `-XTypeFamilies` and `-XGADTs`. You can switch it off again with `-XNoMonoLocalBinds` but type inference becomes less predicatable if you do so. (Read the papers!)
So it seems this is clash's problem, after all, in setting a wonky configuration. I think this ticket can be closed as invalid, but one of the posters should double-check me before closing. Thanks, @thomie, for the analysis! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10134#comment:20 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler