Service Container Binding with \Closure only

[peterfox]

It would be pretty easy to make the following possible:

$container->bind(function (): \SomeClass|\SomeInterface {
    return new \SomeClass();
});

Then using reflection the return type of the \Closure could be used as the abstract. This would be in line with some of the changes over the years to things like the EventFake's assertDispatched method where a \Closure can be provided with a type hint for the first parameter to the closure, configuring which Event class to expect to be dispatched, reducing the arguments to the method.

This functionality could be additive to Laravel as far as I can tell as there's no type hinting on the $abstract arg to stop the use of a \Closure. Instead when a \Closure is used.

Additonal Benefit

In the future, Closures with a return type hint can be used with Container::getBindings() to work out what Class will be returned and allow for a debug container command to be created to display more info about what the container has bound and where in the code base it was added to the container via reflection as well.

Work

Happy to add this if it would be accepted.