#12989: ($) can have a more general type -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by rwbarton): I don't know whether this would be kosher, but one possibility would be to skip the kind check on `arg1_ty` in the type checker special case for `arg1 $ arg2` and then rewrite the expression into {{{arg1 `good` arg2}}}. (Or for that matter, into a direct application `arg1 arg2`.) That would never change semantics because it only applies to a saturated application of `($)` in the first place. You still wouldn't be able to use `($)` with unboxed argument type in a higher-order context, but at least you would be able to write things like `I# $ x# +# y +# z#`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12989#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler