error[E0658]: multiple patterns in `if let` and `while let` are unstable (see issue #48215)
  --> $DIR/feature-gate-if_while_or_patterns.rs:12:5
   |
LL | /     if let 0 | 1 = 0 { //~ ERROR multiple patterns in `if let` and `while let` are unstable
LL | |         ;
LL | |     }
   | |_____^
   |
   = help: add #![feature(if_while_or_patterns)] to the crate attributes to enable

error[E0658]: multiple patterns in `if let` and `while let` are unstable (see issue #48215)
  --> $DIR/feature-gate-if_while_or_patterns.rs:15:5
   |
LL | /     while let 0 | 1 = 1 { //~ ERROR multiple patterns in `if let` and `while let` are unstable
LL | |         break;
LL | |     }
   | |_____^
   |
   = help: add #![feature(if_while_or_patterns)] to the crate attributes to enable

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0658`.