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Create TypeVarInstance type for legacy typevars (#16538)

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We are currently representing type variables using a `KnownInstance`
variant, which wraps a `TypeVarInstance` that contains the information
about the typevar (name, bounds, constraints, default type). We were
previously only constructing that type for PEP 695 typevars. This PR
constructs that type for legacy typevars as well.

It also detects functions that are generic because they use legacy
typevars in their parameter list. With the existing logic for inferring
specializations of function calls (#17301), that means that we are
correctly detecting that the definition of `reveal_type` in the typeshed
is generic, and inferring the correct specialization of `_T` for each
call site.

This does not yet handle legacy generic classes; that will come in a
follow-on PR.
This commit is contained in:
Douglas Creager
2025-04-29 09:03:06 -04:00
committed by GitHub
parent 3c460a7b9a
commit ca4fdf452d
22 changed files with 1100 additions and 191 deletions
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crates/red_knot_python_semantic/resources/mdtest/subscript/lists.md
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@@ -12,7 +12,7 @@ x = [1, 2, 3]
reveal_type(x) # revealed: list
# TODO reveal int
reveal_type(x[0]) # revealed: @Todo(Support for `typing.TypeVar` instances in type expressions)
reveal_type(x[0]) # revealed: Unknown
# TODO reveal list
reveal_type(x[0:1]) # revealed: @Todo(specialized non-generic class)