[GHC] #3741: ghci misinterprets "early" unicode characters

[GHC]

#3741: ghci misinterprets "early" unicode characters
---------------------------------+------------------------------------------
    Reporter:  brian             |       Owner:              
        Type:  bug               |      Status:  new         
    Priority:  normal            |   Component:  GHCi        
     Version:  6.10.4            |    Keywords:              
          Os:  Unknown/Multiple  |    Testcase:              
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown
---------------------------------+------------------------------------------
 It seems as if ghci misinterprets unicode characters if they occur too
 early in a source file.


 {{{
 $ cat test.hs
 --data A = A -- example will not work if this line is commented
 笑 :: [a] -> Int
 笑 = length
 }}}

 {{{
 $ ghci test.hs
 GHCi, version 6.10.4: http://www.haskell.org/ghc/  :? for help
 Loading package ghc-prim ... linking ... done.
 Loading package integer ... linking ... done.
 Loading package base ... linking ... done.
 [1 of 1] Compiling Main             ( test.hs, interpreted )

 test.hs:2:0:
     Illegal signature in pattern: [a] -> Int 笑
         Use -XScopedTypeVariables to permit it
 Failed, modules loaded: none.
 Prelude>
 }}}

 Uncommenting the first line makes the problem go away.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3741>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler