#10817: Looping default associated type family without UndecidableInstances -------------------------------------+------------------------------------- Reporter: goldfire | Owner: Type: bug | Status: patch Priority: normal | Milestone: Component: Compiler (Type | Version: 7.10.2 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: Phab:D1262 -------------------------------------+------------------------------------- Comment (by Richard Eisenberg <eir@…>): In [changeset:"e27b267f3675180c03a75282dd952b8a59339a1f/ghc" e27b267/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="e27b267f3675180c03a75282dd952b8a59339a1f" Perform a validity check on assoc type defaults. This fixes #10817 and #10899. A knock-on effect is that we must now remember locations of associated type defaults for error messages during validity checking. This isn't too bad, but it increases the size of the diff somewhat. Test cases: indexed-types/should_fail/T108{17,99} }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10817#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler