human
Solve the following python programming problem given the following code:
def assert_warnings(fn, warnings, regex = False) : 
    'Assert that each of the given warnings are emitted by fn.' 
    from.assertions import eq_, emits_warning 
    canary = [] 
    orig_warn = util.warn 
    def capture_warnings(* args, **kw) : 
        orig_warn (* args, ** kw) 
        popwarn = warnings.pop (0) 
        canary.append (popwarn) 
        if regex : 
            assert re.match (popwarn, args [0]) 
else : 
            eq_ (args [0], popwarn) 
util.warn = util.langhelpers.warn = capture_warnings 
    result = emits_warning () (fn) () 
    assert fn, 'No warning was emitted' 
    return result 

    
    

    Fix the buggy line: assert fn, 'No warning was emitted'
assistant
#Here is Python program to fix the buggy line: assert fn, 'No warning was emitted'
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assert canary, 'No warning was emitted'