[PyPy-issue] [issue517] `_ast` make `lineno` and `col_offset` optional

[Vincent Legoll]

Vincent Legoll <vincent.legoll at gmail.com> added the comment:

BTW there are other places that use lineno & co. for example in
ASTBuilder.error(), should those uses be safeguarded against being undefined ?

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PyPy development tracker <pypy-dev-issue at codespeak.net>
<https://codespeak.net/issue/pypy-dev/issue517>
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