1error[E0259]: the name `core` is defined multiple times 2 --> $DIR/no-std-inject.rs:3:1 3 | 4LL | extern crate core; 5 | ^^^^^^^^^^^^^^^^^^ `core` reimported here 6 | 7 = note: `core` must be defined only once in the type namespace of this module 8help: you can use `as` to change the binding name of the import 9 | 10LL | extern crate core as other_core; 11 | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 12 13error: aborting due to previous error 14 15For more information about this error, try `rustc --explain E0259`. 16