Function standard_associated_binding 

pub fn standard_associated_binding(
    receiver: &str,
    method: &str,
) -> Option<&'static StdBinding>

The standard-library binding for Receiver.method(...), a call on the type’s own name, if that associated function’s body has moved out of Rust.

Only StdBindingKind::Associated entries answer here, for the reason standard_binding gives.