fix incomplete pattern match warning
There was not really a bug here, because the 2 lists are always the same length, but the compiler does not know that.
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@ -330,6 +330,7 @@ graftTree' subtree graftloc basetree repo hdl = go basetree subdirs graftdirs
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return (newshas ++ rest)
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mkTree hdl t'
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go _ _ [] = return subtree
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go _ [] _ = return subtree
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graftin t = recordSubTree hdl $ graftin' t
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graftin' [] = RecordedSubTree graftloc subtree []
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