warning: crate-level attribute should be an inner attribute
  --> $DIR/linker-warning.rs:7:1
   |
LL | #[allow(linker_messages)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
note: the lint level is defined here
  --> $DIR/linker-warning.rs:3:9
   |
LL | #![warn(unused_attributes)]
   |         ^^^^^^^^^^^^^^^^^
help: add a `!`
   |
LL | #![allow(linker_messages)]
   |  +

warning: unused attribute
  --> $DIR/linker-warning.rs:4:1
   |
LL | #![allow(linker_messages)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
   |
   = note: the `linker_messages` lint can only be controlled at the root of a crate that needs to be linked

warning: 2 warnings emitted