Guido van Rossum <gu...@python.org> 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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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46396>
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