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TypeAlias from typing_extensions is not recognised #1161

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layday opened this issue Nov 11, 2020 · 3 comments
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TypeAlias from typing_extensions is not recognised #1161

layday opened this issue Nov 11, 2020 · 3 comments
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addressed in next version Issue is fixed and will appear in next published version bug Something isn't working

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@layday
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layday commented Nov 11, 2020

Describe the bug
The TypeAlias backport from typing_extensions cannot be used as a substitute for the Python 3.10 TypeAlias.

To Reproduce
Type check the snippet below.

Expected behavior
That foo: TypeAlias = str would not produce any errors.

Screenshots or Code

from typing_extensions import TypeAlias

# Expression of type "Type[str]" cannot be assigned to declared type "TypeAlias"
#   Type "Type[str]" cannot be assigned to type "TypeAlias"
foo: TypeAlias = str

VS Code extension or command-line
Either, 1.1.85
@erictraut
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Thanks for the bug report. This will be fixed in the next version.

(I appreciate you sending me some bugs with easy fixes. I've been working on some of your earlier bug reports off and on for over three weeks!)

@erictraut erictraut added addressed in next version Issue is fixed and will appear in next published version bug Something isn't working labels Nov 11, 2020
@layday
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layday commented Nov 12, 2020

I'm happy to contribute in this small way - I've just sent another easily-fixable bug your way ;)

@erictraut
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This is now addressed in 1.1.86, which I just published. It will also be included in the next release of pylance.

heejaechang pushed a commit to heejaechang/pyright that referenced this issue Nov 3, 2021
@jakebailey
Merge pull request microsoft#1161 from jakebailey/pull-pyright-124
0637345 
Sync pyright
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@erictraut @layday