error: denote infinite loops with `loop { ... }`
  --> $DIR/lint-change-warnings.rs:5:5
   |
LL |     while true {}
   |     ^^^^^^^^^^ help: use `loop`
   |
note: the lint level is defined here
  --> $DIR/lint-change-warnings.rs:1:9
   |
LL | #![deny(warnings)]
   |         ^^^^^^^^
   = note: `#[deny(while_true)]` implied by `#[deny(warnings)]`

warning: denote infinite loops with `loop { ... }`
  --> $DIR/lint-change-warnings.rs:15:5
   |
LL |     while true {}
   |     ^^^^^^^^^^ help: use `loop`
   |
   = note: `#[warn(while_true)]` on by default

error: denote infinite loops with `loop { ... }`
  --> $DIR/lint-change-warnings.rs:20:5
   |
LL |     while true {}
   |     ^^^^^^^^^^ help: use `loop`
   |
note: the lint level is defined here
  --> $DIR/lint-change-warnings.rs:18:10
   |
LL | #[forbid(warnings)]
   |          ^^^^^^^^
   = note: `#[forbid(while_true)]` implied by `#[forbid(warnings)]`

error: aborting due to 2 previous errors; 1 warning emitted