error[E0326]: implemented const `VALUE` has an incompatible type for trait --> $DIR/issue-70942-trait-vs-impl-mismatch.rs:8:18 | LL | const VALUE: i32 = 0; | ^^^ expected `usize`, found `i32` | note: type in trait --> $DIR/issue-70942-trait-vs-impl-mismatch.rs:2:18 | LL | const VALUE: usize; | ^^^^^ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0326`.