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ruff/crates/red_knot_python_semantic/resources/mdtest/binary/classes.md
Douglas Creager 5e9259c96c
Don't special-case class instances in binary expression inference (#15161) 
Just like in #15045 for unary expressions: In binary expressions, we
were only looking for dunder expressions for `Type::Instance` types. We
had some special cases for coercing the various `Literal` types into
their corresponding `Instance` types before doing the lookup. But we can
side-step all of that by using the existing `Type::to_meta_type` and
`Type::to_instance` methods.
2025-01-06 13:50:20 -05:00

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Binary operations on classes

Union of two classes

Unioning two classes via the | operator is only available in Python 3.10 and later.

[environment]
python-version = "3.10"

class A: ...
class B: ...

reveal_type(A | B)  # revealed: UnionType

Union of two classes (prior to 3.10)

class A: ...
class B: ...

# error: "Operator `|` is unsupported between objects of type `Literal[A]` and `Literal[B]`"
reveal_type(A | B)  # revealed: Unknown