#12928: Too easy to trigger CUSK condition using TH -------------------------------------+------------------------------------- Reporter: int-index | Owner: Type: feature request | Status: new Priority: high | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by int-index): How come we don't have a notion of "complete user-supplied type" to support polymorphic recursion at term level? Also I've noticed that with GHC HEAD the error message is way worse: {{{ Cusk.hs:27:15: error: • Illegal type synonym family application in instance: Proxy a1627472612 • In the type instance declaration for ‘Apply’ }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12928#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler