Better error message on syntax errors.

[pytestbot]

Originally reported by: Jurko Gospodnetić (BitBucket: jurko, GitHub: jurko)

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When pytest is run on the following module:

def f(): return []
f() += [5]

It reports a confusing error message:

E   SystemError: ..\Objects\tupleobject.c:126: bad argument to internal function

While when that same module is run directly it reports a clearer:

SyntaxError: can't assign to function call

On other types of errors (e.g. replace the last line of the initial script with just 'foo'), error messages returned by pytest & direct Python calls match.

Can the error message presented by pytest be improved?

Tested using pytest 2.2.4 on Windows 7 x64 with 64bit Python 3.2.3.

Best regards,
Jurko Gospodnetić

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/154

[pytestbot]

Original comment by Ronny Pfannschmidt (BitBucket: RonnyPfannschmidt, GitHub: RonnyPfannschmidt):

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works in recent py.test