#1041: Bang patterns in do notation and lambdas
--+-
Reporter: dons | Owner:
Type: bug| Status: new
Priority: normal | Milestone:
Component: Compiler (Parser) | Version: 6.6
Severity: normal |Keywords: bang patterns
Difficulty: Easy (1 hr)|Testcase:
Architecture: Unknown| Os: Unknown
--+-
Bang patterns in do-notation and lambdas need parentheses around them to
parse. This isn't the case for ~ patterns, or bang patterns in let
bindings. Seems like a wibble.
{{{
{-# OPTIONS -fbang-patterns #-}
-- doesn't work:A.hs:5:8: Empty 'do' construct
main1 = do
!c - return ()
return ()
-- doesn't work:A.hs:12:24: parse error on input `!'
main2 = return () = \ !c - return ()
-- does
main3 = do
(!c) - return ()
return ()
-- does
main4 = return () = \ (!c) - return ()
-- does
main5 = let !x = 1 in return ()
-- does
main6 = do
~c - return ()
return ()
-- does
main7 = return () = \ ~c - return ()
}}}
-- dons
--
Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/1041
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler___
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
