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Parser/parsetok.c was recently changed (e.g. http://hg.python.org/cpython/rev/2bd7f40108b4 ) to raise an error if multiple statements were found in a single-statement compile call. It sensibly ignores trailing whitespace and comments. Unfortunately,
(1) It looks only at (c == ' ' || c == '\t' || c == '\n' || c == '014円') as opposed to using Py_UNICODE_ISSPACE(ch)
(2) It assumes that a "#" means the rest of the line is OK, instead of looking for additional linebreaks.
Not sure whether to mark this a bug or an enhancement, since it is already strictly better than the 3.2 behavior of never warning about extra text.