src/test/ui/feature-gate/duplicate-features.stderr

   1 error[E0636]: the feature `if_let` has already been declared
   2   --> $DIR/duplicate-features.rs:7:12
   3    |
   4 LL | #![feature(if_let)]
   5    |            ^^^^^^
   6
   7 error[E0636]: the feature `rust1` has already been declared
   8   --> $DIR/duplicate-features.rs:4:12
   9    |
  10 LL | #![feature(rust1)]
  11    |            ^^^^^
  12
  13 error: aborting due to 2 previous errors
  14
  15 For more information about this error, try `rustc --explain E0636`.