error: the item `allow` is imported redundantly
  --> $DIR/redundant-import-lang-prelude-attr.rs:15:5
   |
LL | use allow;
   |     ^^^^^ the item `allow` is already defined by the extern prelude
   |
note: the lint level is defined here
  --> $DIR/redundant-import-lang-prelude-attr.rs:12:9
   |
LL | #![deny(redundant_imports)]
   |         ^^^^^^^^^^^^^^^^^

error: aborting due to 1 previous error