Allow type parameters without default values to follow those with default values in some situations #392
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This is a backport of python/cpython#118774. The implementation feels unbelievably hacky (we're looking up the value of a local variable in frame two levels up the call stack), but I can't see another way of doing it. I initially tried an approach where we monkeypatched
_GenericAlias.__init__
, but this didn't work: see python/cpython#118774 (comment).