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: const `impl` for trait `Default` which is not marked with `#[const_trait]` --> $DIR/derive-const-use.rs:6:12 | LL | impl const Default for A { | ^^^^^^^ | = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const` = note: adding a non-const method body in the future would be a breaking change error: const `impl` for trait `PartialEq` which is not marked with `#[const_trait]` --> $DIR/derive-const-use.rs:10:12 | LL | impl const PartialEq for A { | ^^^^^^^^^ | = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const` = note: adding a non-const method body in the future would be a breaking change error: const `impl` for trait `Default` which is not marked with `#[const_trait]` --> $DIR/derive-const-use.rs:14:16 | LL | #[derive_const(Default, PartialEq)] | ^^^^^^^ | = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const` = note: adding a non-const method body in the future would be a breaking change = note: this error originates in the derive macro `Default` (in Nightly builds, run with -Z macro-backtrace for more info) error: const `impl` for trait `PartialEq` which is not marked with `#[const_trait]` --> $DIR/derive-const-use.rs:14:25 | LL | #[derive_const(Default, PartialEq)] | ^^^^^^^^^ | = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const` = note: adding a non-const method body in the future would be a breaking change = note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to 6 previous errors For more information about this error, try `rustc --explain E0635`.