[issue43798] Add position metadata to alias AST type

[Lysandros Nikolaou]

Lysandros Nikolaou <lisandrosnik at gmail.com> added the comment:

I'm okay with this, unless someone has any input on why the alias node should not have line/column info (and did not have it in the first place).

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nosy: +BTaskaya, gvanrossum, lys.nikolaou, pablogsal

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43798>
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