Overlapping patterns warning misplaced
Consider
{-# OPTIONS_GHC -fwarn-overlapping-patterns #-}
len [] = 0
len (_:t) = 1 + len t
len _ = error "urk"
GHC reports the problem with this definition at the first line of it. I think it would be more helpful to have it at the last line, which is the pattern that will never match.
Trac metadata
Trac field | Value |
---|---|
Version | 7.7 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | low |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
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Blocking | |
CC | |
Operating system | |
Architecture |