[issue25390] Can't define a typing.Union containing a typing.re.Pattern

[Guido van Rossum]

Guido van Rossum added the comment:

Confirmed. The failure is because Pattern is _TypeAlias, which is not a type. But it should be allowed. I'll think of something. (Does mypy accept this?)

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nosy: +gvanrossum

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25390>
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