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error[E0658]: use of unstable library feature `derive_const`
--> $DIR/derive-const-gate.rs:1:3
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LL | #[derive_const(Default)]
| ^^^^^^^^^^^^
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= help: add `#![feature(derive_const)]` to the crate attributes to enable
= note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
error: const `impl` for trait `Default` which is not marked with `#[const_trait]`
--> $DIR/derive-const-gate.rs:1:16
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LL | #[derive_const(Default)]
| ^^^^^^^ this trait is not `const`
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= 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: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0658`.
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