Revert "frontend: fix exception tests for F31"
    
    This reverts commit 7cd0a9814394538307d4ceed66b9075770851663.
    
    There is nothing wrong with the reverted commit but it shouldn't be
    required. Actually, the tests failed because they discovered a bug
    in our error handler. By reverting the commit we can make sure the bug
    is now gone.