[issue46396] Typing: test invalid usages of `Concatenate`

[Jelle Zijlstra]

Jelle Zijlstra  added the comment:

Let's change typing_extensions.py too in the same way.

Speaking of typing-extensions, it'd be great if someone could review 
https://github.com/python/typing/pull/963 :)

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[issue46396] Typing: test invalid usages of `Concatenate`

[Nikita Sobolev]

Nikita Sobolev  added the comment:

With this change `typing.py` and `typing_extensions.py` will have different 
logic: 
https://github.com/python/typing/blob/523cf0233edc7a29502fbd30dc6bf641a7408e16/typing_extensions/src/typing_extensions.py#L1805-L1811
 

Jelle, what should we do?

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nosy: +Jelle Zijlstra

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[issue46396] Typing: test invalid usages of `Concatenate`

[Nikita Sobolev]

Nikita Sobolev  added the comment:

> So maybe that code could just be removed?

I see this trend in typing.py :)

I think it makes sense to make all new types (I still consider `ParamSpec` and 
`Concatenate` as new, desipte the fact they are already released in 3.10) as 
flexible as possible.

I will change my PR.

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[issue46396] Typing: test invalid usages of `Concatenate`

[Guido van Rossum]

Guido van Rossum  added the comment:

Arguably the runtime should not check for incorrect calls to Concatenate. 
That's the job of static type checkers. So maybe that code could just be 
removed? (We don't bother checking things like list[0] either.)

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[issue46396] Typing: test invalid usages of `Concatenate`

[Terry J. Reedy]

Change by Terry J. Reedy :


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title: Invalid usage of `Concatenate` is not covered at all -> Typing: test 
invalid usages of `Concatenate`

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