error[E0259]: the name `m1` is defined multiple times --> $DIR/extern-crate-rename.rs:6:1 | LL | extern crate m1; | ---------------- previous import of the extern crate `m1` here LL | extern crate m2 as m1; | ^^^^^^^^^^^^^^^^^^^^^^ `m1` reimported here | = note: `m1` 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 | extern crate m2 as other_m1; | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0259`.