W292: error message gets shown three times

[jugmac00]

While preparing a code snippet for #947 I encountered another bug

test.py

#: does not raise E265

a = print  #: neither raises E265

#raises

=>

❯ pycodestyle test.py 
test.py:5:1: E265 block comment should start with '# '
test.py:5:8: W292 no newline at end of file
test.py:5:8: W292 no newline at end of file
test.py:5:8: W292 no newline at end of file

or minimal

#a

=>

❯ pycodestyle test.py 
test.py:1:1: E265 block comment should start with '# '
test.py:1:3: W292 no newline at end of file
test.py:1:3: W292 no newline at end of file
test.py:1:3: W292 no newline at end of file

pycodestyle --version
2.6.0

[asottile]

interesting, this appears to be due to an edgecase in the tokenizer with comments:

$ python3 -m tokenize ../g.py 
0,0-0,0:            ENCODING       'utf-8'        
1,0-1,1:            NUMBER         '1'            
1,1-1,2:            NEWLINE        ''             
2,0-2,0:            ENDMARKER      ''             
$ python3 -m tokenize ../f.py 
0,0-0,0:            ENCODING       'utf-8'        
1,0-1,2:            COMMENT        '#a'           
1,2-1,2:            NL             ''             
1,2-1,3:            NEWLINE        ''             
2,0-2,0:            ENDMARKER      ''