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[ty] Improve generic class constructor inference (#21442)

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## Summary

We currently fail to account for the type context when inferring generic
classes constructed with `__new__`, or synthesized `__init__` for
dataclasses.
This commit is contained in:
Ibraheem Ahmed 2025-11-14 15:25:47 -05:00 • committed by GitHub
parent ffb7bdd595
commit 2a2b719f00
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4 changed files with 93 additions and 46 deletions
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32
crates/ty_python_semantic/resources/mdtest/assignment/annotations.md
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@ -324,25 +324,25 @@ class X[T]:
def __init__(self, value: T):
self.value = value
a: X[int] = X(1)
reveal_type(a) # revealed: X[int]
x1: X[int] = X(1)
reveal_type(x1) # revealed: X[int]
b: X[int | None] = X(1)
reveal_type(b) # revealed: X[int | None]
x2: X[int | None] = X(1)
reveal_type(x2) # revealed: X[int | None]
c: X[int | None] | None = X(1)
reveal_type(c) # revealed: X[int | None]
x3: X[int | None] | None = X(1)
reveal_type(x3) # revealed: X[int | None]
def _[T](a: X[T]):
b: X[T | int] = X(a.value)
reveal_type(b) # revealed: X[T@_ | int]
def _[T](x1: X[T]):
x2: X[T | int] = X(x1.value)
reveal_type(x2) # revealed: X[T@_ | int]
d: X[Any] = X(1)
reveal_type(d) # revealed: X[Any]
x4: X[Any] = X(1)
reveal_type(x4) # revealed: X[Any]
def _(flag: bool):
a: X[int | None] = X(1) if flag else X(2)
reveal_type(a) # revealed: X[int | None]
x5: X[int | None] = X(1) if flag else X(2)
reveal_type(x5) # revealed: X[int | None]
```
```py
@ -353,8 +353,7 @@ class Y[T]:
value: T
y1: Y[Any] = Y(value=1)
# TODO: This should reveal `Y[Any]`.
reveal_type(y1) # revealed: Y[int]
reveal_type(y1) # revealed: Y[Any]
```
```py
@ -363,8 +362,7 @@ class Z[T]:
return super().__new__(cls)
z1: Z[Any] = Z(1)
# TODO: This should reveal `Z[Any]`.
reveal_type(z1) # revealed: Z[int]
reveal_type(z1) # revealed: Z[Any]
```
## PEP-604 annotations are supported