#11465: Eliminate check_lifted check in TcValidity -------------------------------------+------------------------------------- Reporter: simonpj | Owner: Type: bug | Status: closed Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 7.10.3 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D1807 Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): The test case for this was as follows {{{ class BoxIt (a :: TYPE 'Unlifted) where type Boxed a :: * boxed :: a -> Boxed a instance BoxIt Char# where type Boxed Char# = Char boxed x = C# x main :: IO () main = print $ boxed 'c'# }}} After refactoring the levity stuff as per #11471, this test failed (of course). But as I look at it, it's amazing that it ever worked. The width to the argument of `boxed` is entirely unknowable. Anyway, it's all much better now. :) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11465#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler