How do I write multi-file test that are expected to fail?

[Jan Stolarek]

I want to write a test where I import several modules into module Foo and expect that compilation 
of Foo fails. How do I do that? If I write:

test('T6018fail', normal, compile_fail, [''])

I get en error:

T6018fail.hs:5:1:
    Failed to load interface for `T6018Afail'
    Use -v to se a list of the files searched for.

If I use multimod_compile instead of compile_fail then I get an error because compilation is 
expected to succeed. Help?

Janek