ruff/crates/red_knot_python_semantic/resources/mdtest/call/builtins.md

Calling builtins

bool with incorrect arguments

class NotBool:
    __bool__ = None

# error: [too-many-positional-arguments] "Too many positional arguments to class `bool`: expected 1, got 2"
bool(1, 2)

# TODO: We should emit an `unsupported-bool-conversion` error here because the argument doesn't implement `__bool__` correctly.
bool(NotBool())

Calls to type()

A single-argument call to type() returns an object that has the argument's meta-type. (This is tested more extensively in crates/red_knot_python_semantic/resources/mdtest/attributes.md, alongside the tests for the __class__ attribute.)

reveal_type(type(1))  # revealed: Literal[int]

But a three-argument call to type creates a dynamic instance of the type class:

reveal_type(type("Foo", (), {}))  # revealed: type

Other numbers of arguments are invalid

# error: [no-matching-overload] "No overload of class `type` matches arguments"
type("Foo", ())

# error: [no-matching-overload] "No overload of class `type` matches arguments"
type("Foo", (), {}, weird_other_arg=42)