error[E0658]: `become` expression is experimental
  --> $DIR/feature-gate-explicit_tail_calls.rs:2:5
   |
LL |     become bottom();
   |     ^^^^^^^^^^^^^^^
   |
   = note: see issue #112788 <https://github.com/rust-lang/rust/issues/112788> for more information
   = help: add `#![feature(explicit_tail_calls)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error[E0658]: `become` expression is experimental
  --> $DIR/feature-gate-explicit_tail_calls.rs:6:5
   |
LL |     become you();
   |     ^^^^^^^^^^^^
   |
   = note: see issue #112788 <https://github.com/rust-lang/rust/issues/112788> for more information
   = help: add `#![feature(explicit_tail_calls)]` to the crate attributes to enable
   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date

error: aborting due to 2 previous errors

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