[ ghc-Bugs-768658 ] bad warning for parallel list comprehension

Bugs item #768658, was opened at 2003-07-09 11:47
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Category: Compiler
Group: 6.0
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: bad warning for parallel list comprehension

Initial Comment:
this piece of code:

module ParComp where

t :: [(Char,Char)]
t = [ (a,b) | a <- "foo" | b <- "bar" ]

will generate this warning:
ParComp.hs:4: Warning: Defined but not used: b

ParComp.hs:4: Warning: Defined but not used: a

This is on Linux ghc version 6.0

Brett Letner
bletner@xxxxxxxxxx


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