#10177: Typeable solver regression -------------------------------------+------------------------------------- Reporter: glguy | Owner: Type: bug | Status: new Priority: highest | Milestone: 7.10.1 Component: Compiler (Type | Version: 7.10.1-rc3 checker) | Keywords: Resolution: | Architecture: Operating System: Unknown/Multiple | Unknown/Multiple Type of failure: GHC rejects | Test Case: valid program | testsuite/tests/typecheck/should_compile/T10177 Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by simonpj): * status: closed => new * resolution: fixed => Comment: Actually I really don't think this code should work. It should be {{{ instance (Typeable n, Typeable a) => C (V n a) }}} Otherwise there is an overlap between the given `(Typeable (V n))` and the built-in instance for `Typeable (V n a)`. Making the code given here work is very fragile, and might depend on solve order. I vote that should fail. Any dissenters? Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10177#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler