error[E0260]: the name `std` is defined multiple times
  --> $DIR/resolve-conflict-item-vs-extern-crate.rs:2:1
   |
LL | mod std {}
   | ^^^^^^^ `std` redefined here
   |
   = note: `std` must be defined only once in the type namespace of this module

error: aborting due to previous error

For more information about this error, try `rustc --explain E0260`.