#3919: Or-patterns as GHC extension -------------------------------------+------------------------------------- Reporter: BjornEdstrom | Owner: Type: feature request | Status: new Priority: normal | Milestone: ⊥ Component: Compiler | Version: 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 Iceland_jack): Regarding syntax, could it use data constructor syntax with a magic module {{{#!hs import GHC.OrPatterns ( (:|:) ) -- ( pattern (:|:) ) ? f A = ... f B = ... f unexpected@(C{} :|: D{} :|: E{}) = pprTrace "f" (ppr unexpected) }}} like Edward's suggestion in Records/OverloadedRecordFields/OverloadedLabels {{{#!hs import GHC.ImplicitValues( p, q, area ) }}} ---- {{{#!hs import qualified GHC.OrPatterns as OR ( (:|:) ) f (C{} OR.:|: D{} OR.:|: E{}) = ... }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/3919#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler