Warning refers to code not in the source

Here's some source:

toXML = toXMLEx (Just . cap)
  where cap ('_':cs) = cap cs
        cap (c:cs) = toUpper c : cs
        cap "" = ""

And here's a warning that refers to notElem which I've not used:

../Gmag/Paradise/Addins/XML/Prim.hs:47:8:
    Warning: Pattern match(es) are non-exhaustive
             In the definition of `cap':
                 Patterns not matched: #x with #x `notElem` [""#]

-- Lennart

Trac metadata

Trac field	Value
Version	6.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Windows
Architecture	Unknown