23ccb52fa6
This cleans up how we handle calling unions of types. #16568 adding a three-level structure for callable signatures (`Signatures`, `CallableSignature`, and `Signature`) to handle unions and overloads. This PR updates the bindings side to mimic that structure. What used to be called `CallOutcome` is now `Bindings`, and represents the result of binding actual arguments against a possible union of callables. `CallableBinding` is the result of binding a single, possibly overloaded, callable type. `Binding` is the result of binding a single overload. While we're here, this also cleans up `CallError` greatly. It was previously extracting error information from the bindings and storing it in the error result. It is now a simple enum, carrying no data, that's used as a status code to talk about whether the overall binding was successful or not. We are now more consistent about walking the binding itself to get detailed information about _how_ the binding was unsucessful. --------- Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com> Co-authored-by: Carl Meyer <carl@astral.sh>
1.1 KiB
1.1 KiB
Pattern matching
With wildcard
def _(target: int):
match target:
case 1:
y = 2
case _:
y = 3
reveal_type(y) # revealed: Literal[2, 3]
Without wildcard
def _(target: int):
match target:
case 1:
y = 2
case 2:
y = 3
# revealed: Literal[2, 3]
# error: [possibly-unresolved-reference]
reveal_type(y)
Basic match
def _(target: int):
y = 1
y = 2
match target:
case 1:
y = 3
case 2:
y = 4
reveal_type(y) # revealed: Literal[2, 3, 4]
Guard with object that implements __bool__ incorrectly
class NotBoolable:
__bool__: int = 3
def _(target: int, flag: NotBoolable):
y = 1
match target:
# error: [unsupported-bool-conversion] "Boolean conversion is unsupported for type `NotBoolable`; its `__bool__` method isn't callable"
case 1 if flag:
y = 2
case 2:
y = 3
reveal_type(y) # revealed: Literal[1, 2, 3]