#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: -------------------------------------+------------------------------------- Comment (by goldfire): What about this? {{{ instance (Typeable a, Typeable b) => C (a b) }}} That looks good to me. But what you have above is just a simple substitution on my instance, so I think it should be good. Can the `Typeable` solver just immediately decompose `Typeable (V n)` to `Typeable n`? Is there a threat that the overlapping instances are semantically different? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10177#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler