#15144: Type inference regression between GHC 8.0.2 and 8.2.2 -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler (Type | Version: 8.2.2 checker) | Resolution: | Keywords: TypeFamilies 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:"ae292c6d1362f34117be75a2553049cec7022244/ghc" ae292c6d/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="ae292c6d1362f34117be75a2553049cec7022244" Do not unify representational equalities This patch is an easy fix to Trac #15144, which was caused by accidentally unifying a representational equality in the unflattener. (The main code in TcInteract was always careful not to do so, but I'd missed the test in the unflattener.) See Note [Do not unify representational equalities] in TcInteract }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15144#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler