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Nov 20, 2025
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[ty] Add more random TypeDetails and tests #21546

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77c144a
Add more random TypeDetails and tests
Gankra Nov 20, 2025
8c483a1
fixups
Gankra Nov 20, 2025
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297 changes: 295 additions & 2 deletions crates/ty_ide/src/inlay_hints.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -971,6 +971,24 @@ mod tests {
w[: tuple[int, str]] = z

---------------------------------------------
info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:2695:7
|
2694 | @disjoint_base
2695 | class tuple(Sequence[_T_co]):
| ^^^^^
2696 | """Built-in immutable sequence.
|
info: Source
--> main2.py:8:5
|
7 | x = (1, 'abc')
8 | y[: tuple[Literal[1], Literal["abc"]]] = x
| ^^^^^
9 | z[: tuple[int, str]] = (i(1), s('abc'))
10 | w[: tuple[int, str]] = z
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/typing.pyi:351:1
|
Expand Down Expand Up @@ -1009,6 +1027,24 @@ mod tests {
10 | w[: tuple[int, str]] = z
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:2695:7
|
2694 | @disjoint_base
2695 | class tuple(Sequence[_T_co]):
| ^^^^^
2696 | """Built-in immutable sequence.
|
info: Source
--> main2.py:9:5
|
7 | x = (1, 'abc')
8 | y[: tuple[Literal[1], Literal["abc"]]] = x
9 | z[: tuple[int, str]] = (i(1), s('abc'))
| ^^^^^
10 | w[: tuple[int, str]] = z
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:348:7
|
Expand Down Expand Up @@ -1047,6 +1083,23 @@ mod tests {
10 | w[: tuple[int, str]] = z
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:2695:7
|
2694 | @disjoint_base
2695 | class tuple(Sequence[_T_co]):
| ^^^^^
2696 | """Built-in immutable sequence.
|
info: Source
--> main2.py:10:5
|
8 | y[: tuple[Literal[1], Literal["abc"]]] = x
9 | z[: tuple[int, str]] = (i(1), s('abc'))
10 | w[: tuple[int, str]] = z
| ^^^^^
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:348:7
|
Expand Down Expand Up @@ -2343,7 +2396,7 @@ mod tests {
"#,
);

assert_snapshot!(test.inlay_hints(), @r"
assert_snapshot!(test.inlay_hints(), @r#"
class MyClass:
def __init__(self):
self.x: int = 1
Expand Down Expand Up @@ -2373,6 +2426,24 @@ mod tests {
8 | a[: MyClass], b[: MyClass] = MyClass(), MyClass()
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:2695:7
|
2694 | @disjoint_base
2695 | class tuple(Sequence[_T_co]):
| ^^^^^
2696 | """Built-in immutable sequence.
|
info: Source
--> main2.py:7:5
|
6 | x[: MyClass] = MyClass()
7 | y[: tuple[MyClass, MyClass]] = (MyClass(), MyClass())
| ^^^^^
8 | a[: MyClass], b[: MyClass] = MyClass(), MyClass()
9 | c[: MyClass], d[: MyClass] = (MyClass(), MyClass())
|

info[inlay-hint-location]: Inlay Hint Target
--> main.py:2:7
|
Expand Down Expand Up @@ -2478,7 +2549,7 @@ mod tests {
9 | c[: MyClass], d[: MyClass] = (MyClass(), MyClass())
| ^^^^^^^
|
");
"#);
}

#[test]
Expand Down Expand Up @@ -2527,6 +2598,25 @@ mod tests {
5 | self.y[: tuple[U@MyClass, U@MyClass]] = y
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:2695:7
|
2694 | @disjoint_base
2695 | class tuple(Sequence[_T_co]):
| ^^^^^
2696 | """Built-in immutable sequence.
|
info: Source
--> main2.py:5:18
|
3 | def __init__(self, x: list[T], y: tuple[U, U]):
4 | self.x[: list[T@MyClass]] = x
5 | self.y[: tuple[U@MyClass, U@MyClass]] = y
| ^^^^^
6 |
7 | x[: MyClass[Unknown | int, str]] = MyClass([x=][42], [y=]("a", "b"))
|

info[inlay-hint-location]: Inlay Hint Target
--> main.py:2:7
|
Expand Down Expand Up @@ -2646,6 +2736,24 @@ mod tests {
9 | a[: MyClass[Unknown | int, str]], b[: MyClass[Unknown | int, str]] = MyClass([x=][42], [y=]("a", "b")), MyClass([x=][42], [y=]("a", "b…
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:2695:7
|
2694 | @disjoint_base
2695 | class tuple(Sequence[_T_co]):
| ^^^^^
2696 | """Built-in immutable sequence.
|
info: Source
--> main2.py:8:5
|
7 | x[: MyClass[Unknown | int, str]] = MyClass([x=][42], [y=]("a", "b"))
8 | y[: tuple[MyClass[Unknown | int, str], MyClass[Unknown | int, str]]] = (MyClass([x=][42], [y=]("a", "b")), MyClass([x=][42], [y=]("a",…
| ^^^^^
9 | a[: MyClass[Unknown | int, str]], b[: MyClass[Unknown | int, str]] = MyClass([x=][42], [y=]("a", "b")), MyClass([x=][42], [y=]("a", "b…
10 | c[: MyClass[Unknown | int, str]], d[: MyClass[Unknown | int, str]] = (MyClass([x=][42], [y=]("a", "b")), MyClass([x=][42], [y=]("a", "…
|

info[inlay-hint-location]: Inlay Hint Target
--> main.py:2:7
|
Expand Down Expand Up @@ -4830,6 +4938,191 @@ mod tests {
"#);
}

#[test]
fn test_literal_group() {
let mut test = inlay_hint_test(
r#"
def branch(cond: int):
if cond < 10:
x = 1
elif cond < 20:
x = 2
elif cond < 30:
x = 3
elif cond < 40:
x = "hello"
else:
x = None
y = x"#,
);

assert_snapshot!(test.inlay_hints(), @r#"
def branch(cond: int):
if cond < 10:
x = 1
elif cond < 20:
x = 2
elif cond < 30:
x = 3
elif cond < 40:
x = "hello"
else:
x = None
y[: Literal[1, 2, 3, "hello"] | None] = x
---------------------------------------------
info[inlay-hint-location]: Inlay Hint Target
--> stdlib/typing.pyi:351:1
|
349 | Final: _SpecialForm
350 |
351 | Literal: _SpecialForm
| ^^^^^^^
352 | TypedDict: _SpecialForm
|
info: Source
--> main2.py:13:9
|
11 | else:
12 | x = None
13 | y[: Literal[1, 2, 3, "hello"] | None] = x
| ^^^^^^^
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/types.pyi:950:11
|
948 | if sys.version_info >= (3, 10):
949 | @final
950 | class NoneType:
| ^^^^^^^^
951 | """The type of the None singleton."""
|
info: Source
--> main2.py:13:37
|
11 | else:
12 | x = None
13 | y[: Literal[1, 2, 3, "hello"] | None] = x
| ^^^^
|
"#);
}

#[test]
fn test_generic_alias() {
let mut test = inlay_hint_test(
r"
class Foo[T]: ...

a = Foo[int]",
);

assert_snapshot!(test.inlay_hints(), @r#"
class Foo[T]: ...

a[: <class 'Foo[int]'>] = Foo[int]
---------------------------------------------
info[inlay-hint-location]: Inlay Hint Target
--> main.py:2:7
|
2 | class Foo[T]: ...
| ^^^
3 |
4 | a = Foo[int]
|
info: Source
--> main2.py:4:13
|
2 | class Foo[T]: ...
3 |
4 | a[: <class 'Foo[int]'>] = Foo[int]
| ^^^
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:348:7
|
347 | @disjoint_base
348 | class int:
| ^^^
349 | """int([x]) -> integer
350 | int(x, base=10) -> integer
|
info: Source
--> main2.py:4:17
|
2 | class Foo[T]: ...
3 |
4 | a[: <class 'Foo[int]'>] = Foo[int]
| ^^^
|
"#);
}

#[test]
fn test_subclass_type() {
let mut test = inlay_hint_test(
r"
def f(x: list[str]):
y = type(x)",
);

assert_snapshot!(test.inlay_hints(), @r#"
def f(x: list[str]):
y[: type[list[str]]] = type(x)
---------------------------------------------
info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:247:7
|
246 | @disjoint_base
247 | class type:
| ^^^^
248 | """type(object) -> the object's type
249 | type(name, bases, dict, **kwds) -> a new type
|
info: Source
--> main2.py:3:9
|
2 | def f(x: list[str]):
3 | y[: type[list[str]]] = type(x)
| ^^^^
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:2802:7
|
2801 | @disjoint_base
2802 | class list(MutableSequence[_T]):
| ^^^^
2803 | """Built-in mutable sequence.
|
info: Source
--> main2.py:3:14
|
2 | def f(x: list[str]):
3 | y[: type[list[str]]] = type(x)
| ^^^^
|

info[inlay-hint-location]: Inlay Hint Target
--> stdlib/builtins.pyi:915:7
|
914 | @disjoint_base
915 | class str(Sequence[str]):
| ^^^
916 | """str(object='') -> str
917 | str(bytes_or_buffer[, encoding[, errors]]) -> str
|
info: Source
--> main2.py:3:19
|
2 | def f(x: list[str]):
3 | y[: type[list[str]]] = type(x)
| ^^^
|
"#);
}

#[test]
fn test_complex_parameter_combinations() {
let mut test = inlay_hint_test(
Expand Down
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