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