error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> $DIR/feature-gate-generic_arg_infer.rs:11:27
   |
LL |     let _x: [u8; 3] = [0; _];
   |                           ^ `_` not allowed here

error: in expressions, `_` can only be used on the left-hand side of an assignment
  --> $DIR/feature-gate-generic_arg_infer.rs:14:18
   |
LL |     let _y: [u8; _] = [0; 3];
   |                  ^ `_` not allowed here

error[E0658]: using `_` for array lengths is unstable
  --> $DIR/feature-gate-generic_arg_infer.rs:14:18
   |
LL |     let _y: [u8; _] = [0; 3];
   |                  ^ help: consider specifying the array length: `3`
   |
   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable

error[E0747]: type provided when a constant was expected
  --> $DIR/feature-gate-generic_arg_infer.rs:20:20
   |
LL |     let _x = foo::<_>([1,2]);
   |                    ^
   |
   = help: const arguments cannot yet be inferred with `_`
   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable

error[E0658]: using `_` for array lengths is unstable
  --> $DIR/feature-gate-generic_arg_infer.rs:11:27
   |
LL |     let _x: [u8; 3] = [0; _];
   |                           ^
   |
   = note: see issue #85077 <https://github.com/rust-lang/rust/issues/85077> for more information
   = help: add `#![feature(generic_arg_infer)]` to the crate attributes to enable

error: aborting due to 5 previous errors

Some errors have detailed explanations: E0658, E0747.
For more information about an error, try `rustc --explain E0658`.