1 error[E0254]: the name `core` is defined multiple times
2 --> $DIR/unresolved-extern-mod-suggestion.rs:2:5
4 LL | extern crate core;
5 | ------------------ previous import of the extern crate `core` here
7 | ^^^^ `core` reimported here
9 = note: `core` must be defined only once in the type namespace of this module
11 error: aborting due to previous error
13 For more information about this error, try `rustc --explain E0254`.