SCC annotations cause compile errors

The following program will not compile:

bad s = take 10 . {-# SCC "foo" #-} drop 10 $ s

It fails with the message

    Couldn't match expected type `a -> [a1]'                                                           
           against inferred type `[a2]'                                                                
    In the second argument of `(.)', namely `(drop 10 $ s)'                                            
    In the expression: take 10 . (drop 10 $ s)                                                         
    In the definition of `bad': bad s = take 10 . (drop 10 $ s)

However, if the SCC annotation is removed it compiles:

good s = take 10 . drop 10 $ s

Adding parentheses can also fix it:

good2 s = take 10 . ({-# SCC "foo" #-} drop 10) $ s

but it's still annoying that adding an annotation can cause compilation to fail.

Trac metadata

Trac field	Value
Version	6.8.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture	Unknown