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I assume the behaviour occurrs when an unknown encoding is
specified.  It can be reproduced on Windows:

compile("# -*- coding: xxx -*-", "test.py", "exec")

It should probably raise a SyntaxError, as trying to import
a module containing this encoding does.

The problem seems that when
PyParser_ParseStringFlagsFilename() calls
PyTokenizer_FromString(), and when the latter fails the
error is set to E_NOMEM.