| error[E0635]: unknown feature `const_default_impls` |
| --> $DIR/derive-const-use.rs:3:41 |
| | |
| LL | #![feature(const_trait_impl, const_cmp, const_default_impls, derive_const, effects)] |
| | ^^^^^^^^^^^^^^^^^^^ |
| |
| error: const `impl` for trait `Default` which is not marked with `#[const_trait]` |
| --> $DIR/derive-const-use.rs:7:12 |
| | |
| 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 `Default` which is not marked with `#[const_trait]` |
| --> $DIR/derive-const-use.rs:15:16 |
| | |
| 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[E0207]: the const parameter `host` is not constrained by the impl trait, self type, or predicates |
| --> $DIR/derive-const-use.rs:7:6 |
| | |
| LL | impl const Default for A { |
| | ^^^^^ unconstrained const parameter |
| | |
| = note: expressions using a const parameter must map each value to a distinct output value |
| = note: proving the result of expressions other than the parameter are unique is not supported |
| |
| error[E0207]: the const parameter `host` is not constrained by the impl trait, self type, or predicates |
| | |
| = note: expressions using a const parameter must map each value to a distinct output value |
| = note: proving the result of expressions other than the parameter are unique is not supported |
| |
| error: aborting due to 5 previous errors |
| |
| Some errors have detailed explanations: E0207, E0635. |
| For more information about an error, try `rustc --explain E0207`. |
