Serhiy Storchaka added the comment:

Similar feature is needed for warnings in the re module. Methods of regular 
expression pattern can be called directly or from module-level wrappers. In 
these case the stack level differs by 1. And sometimes warnings are emitted in 
recursive parser, when stack level is variable.

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23810>
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