#9183: GHC shouldn't expand constraint synonyms -------------------------------------+------------------------------------ Reporter: Feuerbach | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by goldfire): You can do the `MyConstraint` trick today: {{{ class (Show a, Eq a, Num a) => MyConstraint a instance (Show a, Eq a, Num a) => MyConstraint a }}} Haven't tested this in error messages, exactly, but my guess is that it will behave better. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9183#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler