#11367: [Regression] Only one clause allowed in (explicitly bidirectional) pattern synonyms -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.1 Resolution: | Keywords: | 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): Wiki Page: | -------------------------------------+------------------------------------- Comment (by mpickering):
Personally a trailing where is quite alright and handy when quickly checking if a declaration is otherwise OK.
I don't understand this comment. The trailing where indicates a bidirectional pattern synonym so you have to provide the builder as well as the matcher. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11367#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler