Feature Request: Completion for class function that is not inherent method

[hehaoqian]

According to Rust API guidelines,

Smart pointers do not add inherent methods (C-SMART-PTR)

Therefore, smart pointer structs, such as Box, Arc
have many class function that is not method,
and the first parameter is the type itself
such as Box::into_raw, Arc::into_inner

pub fn into_raw(b: Box<T, A>) -> *mut T

pub fn into_inner(this: Arc<T, A>) -> Option<T>

Is it possible to add these functions to completion, when I press the period character after the object variable?
The functions can be limited to the function whose first parameter is Self, &Self, &mut Self
For example

let foo = Arc::new(1);
let bar = foo.

Is it possible to show Arc::into_inner in the completion list?
When the completion is accepted, the code is automatically rewritten to

let foo = Arc::new(1);
let bar = Arc::into_inner(foo);

[ChayimFriedman2]

I think we should postfix-complete any methods taking a variation of Self as a first parameter, not just for smart pointers.