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[ty] Add support for generic PEP695 type aliases (#20219)

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## Summary

Adds support for generic PEP695 type aliases, e.g.,
```python
type A[T] = T
reveal_type(A[int]) # A[int]
```

Resolves https://github.com/astral-sh/ty/issues/677.
This commit is contained in:
Ibraheem Ahmed 2025-09-08 16:26:21 -04:00 • committed by GitHub
parent d55edb3d74
commit aa5d665d52
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8 changed files with 510 additions and 70 deletions
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31
crates/ty_ide/src/hover.rs
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@ -312,14 +312,14 @@ mod tests {
This is such a great class!!
Don't you know?
Everyone loves my class!!
'''
def __init__(self, val):
"""initializes MyClass (perfectly)"""
self.val = val
def my_method(self, a, b):
'''This is such a great func!!
@ -379,14 +379,14 @@ mod tests {
This is such a great class!!
Don't you know?
Everyone loves my class!!
'''
def __init__(self, val):
"""initializes MyClass (perfectly)"""
self.val = val
def my_method(self, a, b):
'''This is such a great func!!
@ -444,14 +444,14 @@ mod tests {
This is such a great class!!
Don't you know?
Everyone loves my class!!
'''
def __init__(self, val):
"""initializes MyClass (perfectly)"""
self.val = val
def my_method(self, a, b):
'''This is such a great func!!
@ -505,7 +505,7 @@ mod tests {
This is such a great class!!
Don't you know?
Everyone loves my class!!
'''
@ -562,13 +562,13 @@ mod tests {
This is such a great class!!
Don't you know?
Everyone loves my class!!
'''
def __init__(self, val):
self.val = val
def my_method(self, a, b):
'''This is such a great func!!
@ -628,14 +628,14 @@ mod tests {
This is such a great class!!
Don't you know?
Everyone loves my class!!
'''
def __init__(self, val):
"""initializes MyClass (perfectly)"""
self.val = val
def my_method(self, a, b):
'''This is such a great func!!
@ -1589,12 +1589,11 @@ def ab(a: int, *, c: int):
"#,
);
// TODO: This should render T@Alias once we create GenericContexts for type alias scopes.
assert_snapshot!(test.hover(), @r"
typing.TypeVar
T@Alias
---------------------------------------------
```python
typing.TypeVar
T@Alias
```
---------------------------------------------
info[hover]: Hovered content is
@ -1875,9 +1874,9 @@ def ab(a: int, *, c: int):
def foo(a: str | None, b):
'''
My cool func
Args:
a: hopefully a string, right?!
a: hopefully a string, right?!
'''
if a is not None:
print(a<CURSOR>)