error: the item `aux_issue_121915` is imported redundantly
  --> $DIR/redundant-import-extern-prelude.rs:14:9
   |
LL |     use aux_issue_121915;
   |         ^^^^^^^^^^^^^^^^ the item `aux_issue_121915` is already defined by the extern prelude
   |
note: the lint level is defined here
  --> $DIR/redundant-import-extern-prelude.rs:11:8
   |
LL | #[deny(redundant_imports)]
   |        ^^^^^^^^^^^^^^^^^

error: aborting due to 1 previous error