warning: the feature `const_generics` is incomplete and may cause the compiler to crash
  --> $DIR/const-parameter-uppercase-lint.rs:1:12
   |
LL | #![feature(const_generics)]
   |            ^^^^^^^^^^^^^^
   |
   = note: `#[warn(incomplete_features)]` on by default

error: const parameter `x` should have an upper case name
  --> $DIR/const-parameter-uppercase-lint.rs:6:15
   |
LL | fn noop<const x: u32>() {
   |               ^ help: convert the identifier to upper case (notice the capitalization): `X`
   |
note: the lint level is defined here
  --> $DIR/const-parameter-uppercase-lint.rs:4:9
   |
LL | #![deny(non_upper_case_globals)]
   |         ^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error; 1 warning emitted