Since we're using tempfiles we don't see the file name any more -> trace the input file.
Adding 2 tests which shows missing parens around active patterns
Adding a test which shows failing class formatting.
Adding two new failing signature tests
Adding a test which shows failing class inheritance.
Adding a failing test which shows problems with marker interfaces
Creating tests which show problems with mutually recursive functions
Adding two tests which show problems with *** and *= operators
Showing a problem with wrong indentation and attributes