Type checking errors in foreign declarations reported at wrong locations

The following code:

{-# LANGUAGE ForeignFunctionInterface #-}
import Foreign.C.Types

foreign export ccall foo :: CInt -> IO ()
foo "x" = return ()

yields this error:

TestErr.hs:4:0:
    Couldn't match expected type `CInt' against inferred type `[Char]'
    In the expression: foo
    When checking declaration:
        foreign export ccall "foo" foo :: CInt -> IO ()

The error part is notionally correct, but the location where it is reported is wrong - it's reporting the type declaration as erroneous, while type errors would normally report the function definition.

Compare the error with a non-foreign declaration:

{-# LANGUAGE ForeignFunctionInterface #-}
import Foreign.C.Types

foo :: CInt -> IO ()
foo "x" = return ()

giving:

TestErr.hs:5:4:
    Couldn't match expected type `CInt' against inferred type `[Char]'
    In the pattern: "x"
    In the definition of `foo': foo "x" = return ()

This is the error that I wanted to see.

Trac metadata

Trac field	Value
Version	6.12.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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