warning: unused variable: `x`
  --> $DIR/issue-89305.rs:13:13
   |
LL |         let x: () = asm!("nop");
   |             ^ help: if this is intentional, prefix it with an underscore: `_x`
   |
note: the lint level is defined here
  --> $DIR/issue-89305.rs:7:9
   |
LL | #![warn(unused)]
   |         ^^^^^^
   = note: `#[warn(unused_variables)]` implied by `#[warn(unused)]`

warning: 1 warning emitted