error[E0658]: `crate` visibility modifier is experimental
  --> $DIR/feature-gate-crate_visibility_modifier.rs:1:1
   |
LL | crate struct Bender {
   | ^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/53120
   = help: add `#![feature(crate_visibility_modifier)]` to the crate attributes to enable

error: aborting due to previous error

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