error[E0635]: unknown feature `const_cmp`
  --> $DIR/derive-const-use.rs:2:30
   |
LL | #![feature(const_trait_impl, const_cmp, const_default_impls, derive_const)]
   |                              ^^^^^^^^^

error[E0635]: unknown feature `const_default_impls`
  --> $DIR/derive-const-use.rs:2:41
   |
LL | #![feature(const_trait_impl, const_cmp, const_default_impls, derive_const)]
   |                                         ^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0635`.