error: unreachable pattern
  --> $DIR/top-level-alternation.rs:4:23
   |
LL |     while let 0..=2 | 1 = 0 {}
   |                       ^
   |
note: lint level defined here
  --> $DIR/top-level-alternation.rs:1:9
   |
LL | #![deny(unreachable_patterns)]
   |         ^^^^^^^^^^^^^^^^^^^^

warning: irrefutable if-let pattern
  --> $DIR/top-level-alternation.rs:5:20
   |
LL |     if let 0..=2 | 1 = 0 {}
   |                    ^
   |
   = note: `#[warn(irrefutable_let_patterns)]` on by default

error: unreachable pattern
  --> $DIR/top-level-alternation.rs:10:15
   |
LL |             | 0 => {}
   |               ^

error: unreachable pattern
  --> $DIR/top-level-alternation.rs:15:15
   |
LL |             | Some(0) => {}
   |               ^^^^^^^

error: unreachable pattern
  --> $DIR/top-level-alternation.rs:20:9
   |
LL |         (0, 0) => {}
   |         ^^^^^^

error: unreachable pattern
  --> $DIR/top-level-alternation.rs:40:9
   |
LL |         _ => {}
   |         ^

error: unreachable pattern
  --> $DIR/top-level-alternation.rs:44:9
   |
LL |         Some(_) => {}
   |         ^^^^^^^

error: unreachable pattern
  --> $DIR/top-level-alternation.rs:45:9
   |
LL |         None => {}
   |         ^^^^

error: unreachable pattern
  --> $DIR/top-level-alternation.rs:50:9
   |
LL |         None
   |         ^^^^

error: unreachable pattern
  --> $DIR/top-level-alternation.rs:51:15
   |
LL |             | Some(_) => {}
   |               ^^^^^^^

error: unreachable pattern
  --> $DIR/top-level-alternation.rs:55:9
   |
LL |         1..=2 => {},
   |         ^^^^^

error: aborting due to 10 previous errors