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  • Glasgow Haskell Compiler
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  • #10582
Closed
Open
Created Jun 27, 2015 by Richard Eisenberg@raeDeveloper

Tiny bug in lexer around lexing banana brackets

If I say

{-# LANGUAGE Arrows #-}

(|:) :: Int -> Int -> Int
(|:) = (+)

I get

/Users/rae/temp/Bug.hs:3:3: parse error on input ‘:’

Trying this with other operators, like (|+), works fine.

The problem is that notFollowedBySymbol in Lexer.x is slightly wrong.

I will fix in ongoing (mostly unrelated) work.

Trac metadata
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Version 7.10.1
Type Bug
TypeOfFailure OtherFailure
Priority low
Resolution Unresolved
Component Compiler
Test case
Differential revisions
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