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Rewrite zipLazy to be warning-free for GHC 6.4
author
Ian Lynagh
<igloo@earth.li>
Tue, 13 May 2008 19:39:01 +0000
(19:39 +0000)
committer
Ian Lynagh
<igloo@earth.li>
Tue, 13 May 2008 19:39:01 +0000
(19:39 +0000)
compiler/utils/Util.lhs
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diff --git
a/compiler/utils/Util.lhs
b/compiler/utils/Util.lhs
index
1d11b90
..
8cfdf83
100644
(file)
--- a/
compiler/utils/Util.lhs
+++ b/
compiler/utils/Util.lhs
@@
-202,7
+202,12
@@
zipWith4Equal msg _ _ _ _ _ = panic ("zipWith4Equal: unequal lists:"++msg)
zipLazy :: [a] -> [b] -> [(a,b)]
zipLazy [] _ = []
-zipLazy (x:xs) ~(y:ys) = (x,y) : zipLazy xs ys
+-- We want to write this, but with GHC 6.4 we get a warning, so it
+-- doesn't validate:
+-- zipLazy (x:xs) ~(y:ys) = (x,y) : zipLazy xs ys
+-- so we write this instead:
+zipLazy (x:xs) zs = let y : ys = zs
+ in (x,y) : zipLazy xs ys
\end{code}