rust/src/test/ui/error-codes/E0430.stderr

error[E0430]: `self` import can only appear once in an import list
  --> $DIR/E0430.rs:11:16
   |
LL | use std::fmt::{self, self}; //~ ERROR E0430
   |                ^^^^  ---- another `self` import appears here
   |                |
   |                can only appear once in an import list

error[E0252]: the name `fmt` is defined multiple times
  --> $DIR/E0430.rs:11:22
   |
LL | use std::fmt::{self, self}; //~ ERROR E0430
   |                ----  ^^^^ `fmt` reimported here
   |                |
   |                previous import of the module `fmt` here
   |
   = note: `fmt` must be defined only once in the type namespace of this module
help: You can use `as` to change the binding name of the import
   |
LL | use std::fmt::{self, self as other_fmt}; //~ ERROR E0430
   |                      ^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors

You've got a few errors: E0252, E0430
If you want more information on an error, try using "rustc --explain E0252"