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error: const `impl` for trait `A` which is not marked with `#[const_trait]`
--> $DIR/const-impl-requires-const-trait.rs:6:12
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LL | pub trait A {}
| - help: mark `A` as const: `#[const_trait]`
...
LL | impl const A for () {}
| ^
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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
error: aborting due to previous error
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