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e17cd350b6
This updates the `Signature` and `CallBinding` machinery to support multiple overloads for a callable. This is currently only used for `KnownFunction`s that we special-case in our type inference code. It does **_not_** yet update the semantic index builder to handle `@overload` decorators and construct a multi-signature `Overloads` instance for real Python functions. While I was here, I updated many of the `try_call` special cases to use signatures (possibly overloaded ones now) and `bind_call` to check parameter lists. We still need some of the mutator methods on `OverloadBinding` for the special cases where we need to update return types based on some Rust code.
1.1 KiB
1.1 KiB
Narrowing for bool(..) checks
def _(flag: bool):
x = 1 if flag else None
# valid invocation, positive
reveal_type(x) # revealed: Literal[1] | None
if bool(x is not None):
reveal_type(x) # revealed: Literal[1]
# valid invocation, negative
reveal_type(x) # revealed: Literal[1] | None
if not bool(x is not None):
reveal_type(x) # revealed: None
# no args/narrowing
reveal_type(x) # revealed: Literal[1] | None
if not bool():
reveal_type(x) # revealed: Literal[1] | None
# invalid invocation, too many positional args
reveal_type(x) # revealed: Literal[1] | None
# error: [too-many-positional-arguments] "Too many positional arguments to class `bool`: expected 1, got 2"
if bool(x is not None, 5):
reveal_type(x) # revealed: Literal[1] | None
# invalid invocation, too many kwargs
reveal_type(x) # revealed: Literal[1] | None
# error: [unknown-argument] "Argument `y` does not match any known parameter of class `bool`"
if bool(x is not None, y=5):
reveal_type(x) # revealed: Literal[1] | None