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[ty] Remove special casing for string-literal-in-tuple __contains__ (#19642)

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Alex Waygood 2025-07-31 11:28:03 +01:00 • committed by GitHub
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49
crates/ty_python_semantic/resources/mdtest/binary/in.md
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# Static binary operations using `in`
## Basic functionality
This demonstrates type inference support for `<str-literal> in <tuple>`:
```py
from ty_extensions import static_assert
static_assert("foo" in ("quux", "foo", "baz"))
static_assert("foo" not in ("quux", "bar", "baz"))
```
## With variables
```py
from ty_extensions import static_assert
x = ("quux", "foo", "baz")
static_assert("foo" in x)
x = ("quux", "bar", "baz")
static_assert("foo" not in x)
```
## Statically unknown results in a `bool`
```py
def _(a: str, b: str):
reveal_type("foo" in (a, b)) # revealed: bool
```
## Values being unknown doesn't mean the result is unknown
For example, when the types are completely disjoint:
```py
from ty_extensions import static_assert
def _(a: int, b: int):
static_assert("foo" not in (a, b))
```
## Failure cases
```py
# We don't support byte strings.
reveal_type(b"foo" not in (b"quux", b"foo", b"baz")) # revealed: bool
```