[ ghc-Bugs-978107 ] arrow notation example can't be parsed

Bugs item #978107, was opened at 2004-06-23 12:11
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Category: Compiler (Parser)
Group: 6.2
Status: Open
Resolution: None
Priority: 5
Submitted By: John Hughes (rjmh)
Assigned to: Nobody/Anonymous (nobody)
Summary: arrow notation example can't be parsed

Initial Comment:
This expression can't be parsed:

bug f g = proc x -> f >>> g -< x

Brackets are needed around f>>>g to get it through the 
parser. Can't see any justification for this -- the 
documentation suggests any expression is allowed 
before -<, and indeed, >>> cannot be confused with a 
command operator because f is not a command.

Are you parsing -< as an operator with a precedence 
greater than >>>? Hard to see otherwise why this 
doesn't parse.

John

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