#10056: Inconsistent precedence of ~ -------------------------------------+------------------------------------- Reporter: crockeea | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.8.1 Component: Compiler | Version: 7.8.4 (Parser) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: #10059, #10431, | Differential Rev(s): Phab:D4876 #14316, #15457 | Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * related: #10059, #10431, #14316 => #10059, #10431, #14316, #15457 Comment: Replying to [comment:41 simonpj]:
So is `(~)` (in types) handled uniformly with `(!)`? It seems not. Perhaps that's because we don't want to give up `(~)` as an infix operator, but we are willing to give up `(!)`?
Ugh, that's a very good point. We //should// be able to use `!` as a type operator, but because of this lack of uniformity, we can't. We should fix this.
Anyway, it'd be good to summarise how the moving parts fit together, in a Note. There are some e.g. `Note [Parsing ~]`, but they are too brief to do justice to the question.
Indeed, `Note [Parsing ~]` could stand to be a bit longer. I've opened #15457 for both of these issues. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10056#comment:42 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler