1 error: const `impl` for trait `A` which is not marked with `#[const_trait]`
2 --> $DIR/const-impl-requires-const-trait.rs:6:12
5 | - help: mark `A` as const: `#[const_trait]`
7 LL | impl const A for () {}
10 = note: marking a trait with `#[const_trait]` ensures all default method bodies are `const`
11 = note: adding a non-const method body in the future would be a breaking change
13 error: aborting due to previous error