The self
keyword cannot appear alone as the last segment in a use
declaration.
Erroneous code example:
use std::fmt::self; // error: `self` imports are only allowed within a { } list
To use a namespace itself in addition to some of its members, self
may appear as part of a brace-enclosed list of imports:
use std::fmt::{self, Debug};
If you only want to import the namespace, do so directly:
use std::fmt;