[issue44791] Substitution of ParamSpec in Concatenate

[Serhiy Storchaka]

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

PR 27518 fixes a substitution of a ParamSpec variable with a Concatenate nad a list of types. It is not specified explicitly in PEP 612, but it does not contradict it.

PR 30969 makes an ellipsis be valid as the last argument of Concatenate to fix a substitution of a ParamSpec variable with an ellipsis. It contradicts with PEP 612 which allows only a ParamSpec variable there.

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