#10747: Infix pattern synonyms fail to parse (regression) -------------------------------------+------------------------------------- Reporter: heisenbug | Owner: Type: bug | Status: new Priority: high | Milestone: 7.10.3 Component: Compiler | Version: 7.10.1 (Parser) | Keywords: Resolution: | PatternSynonyms Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): -------------------------------------+------------------------------------- Comment (by heisenbug): Replying to [comment:6 mpickering]:
I'm yet to look at this in detail but I suspect that this was never meant to work. I assumed that infix pattern synonyms definitions were meant to be like infix data constructor definitions.
Then it should work: {{{ $ ghci GHCi, version 7.11.20150928: http://www.haskell.org/ghc/ :? for help Prelude> data List a = Nil | a `Cons` List a deriving Show Prelude> 4 `Cons` Nil 4 `Cons` Nil }}} This has been working for ages! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10747#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler