Source Hightlight Filter Test
=============================

Details of the filter can be found in
`./doc/source-highlight-filter.txt`.

[source,python]
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''' A multi-line
    comment.'''
def sub_word(mo):
    ''' Single line comment.'''
    word = mo.group('word')     # Inline comment
    if word in keywords[language]:
        return quote + word + quote
    else:
        return word
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