gh-148945: add support for bounds on type variable tuples and parameter specifications - #148946
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…arameter specifications
Type parameter lists now accept a bound on type variable tuples and
parameter specifications, using the same colon syntax already available
for TypeVar:
def call[*Ts: int, **P: [str]](*args: *Ts, f: Callable[P, int]): ...
A TypeVarTuple bound applies to each type the type variable tuple stands
for and is a star_expression, like its default. A ParamSpec bound is a
parameter list. As with TypeVar bounds, they are lazily evaluated in a
separate annotation scope and are exposed through __bound__ and the
evaluate_bound evaluate function.
The ast.TypeVarTuple and ast.ParamSpec nodes gain a 'bound' field.
Also normalizes ParamSpec('P').__bound__ to None; it was previously
types.NoneType, unlike TypeVar and TypeVarTuple.
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https://discuss.python.org/t/parameter-specification-and-type-variable-tuple-should-support-bounds/107068
📚 Documentation preview 📚: https://cpython-previews--148946.org.readthedocs.build/