[issue3975] PyTraceBack_Print() doesn't respect # coding: xxx header

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

I still have remarks about traceback_unicode-3.patch, that I did not see
before:
- (a minor thing) PyMem_FREE(found_encoding) could appear only once,
just after PyFile_FromFd.
- I feel it dangerous to call the PyUnicode_AS_UNICODE() macro without
checking that PyFile_GetLine() actually returned a PyUnicode object.
- If the "truncated" variable is NULL, an exception has been set; it is
necessary to exit the function.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3975>
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