Detect internal implementation usage that leads to infinite recursion

[TotalKrill]

We found a simple way to cause infinite recursion in a sneaky way, it would be great to be able to have this as a warning or something.

When implementing a trait, that trait can be invoked inside the trait implementation. Causing hard to detect bugs.

Simplest example:

use std::fmt;
pub struct S;
impl fmt::Display for S {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}", self)
    }
}
fn main() {
    print!("{}", S);
}

link to playground

[jonas-schievink]

Duplicate of #57965

[jonas-schievink]

or rather, #58035