[issue40528] Improve / Clear ASDL generator

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

"string" is only used for

* type_comment in a number of statements
* kind in Constant
* tag in type_ignore

For which of them a line number is meaningful and useful?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40528>
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