warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/cannot-infer-const-args.rs:1:12
   |
LL | #![feature(const_generics)]
   |            ^^^^^^^^^^^^^^
   |
   = note: `#[warn(incomplete_features)]` on by default
   = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information

error[E0282]: type annotations needed
  --> $DIR/cannot-infer-const-args.rs:9:5
   |
LL |     foo();
   |     ^^^
   |
   = note: unable to infer the value of a const parameter

error: aborting due to previous error; 1 warning emitted

For more information about this error, try `rustc --explain E0282`.