#13186: Change EvNum to EvNum :: Natural -> EvLit -------------------------------------+------------------------------------- Reporter: phadej | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #8306 #8412 | Differential Rev(s): #13181 | Wiki Page: | -------------------------------------+------------------------------------- Comment (by phadej): Currently we can get: {{{ Prelude> :set -XDataKinds -XNegativeLiterals Prelude> :m +Data.Proxy Prelude Data.Proxy> Proxy :: Proxy (-1) }}} Even this case could (and should?) be ruled out in parser, thru `template- haskell` you can still inject negative integers. Thus the workaround fix is currently in the renamer. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13186#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler