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error: to use a constant of type `B` in a pattern, `B` must be annotated with `#[derive(PartialEq, Eq)]`
--> $DIR/match-nonempty-array-forbidden-without-eq.rs:16:9
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LL | FOO => { }
| ^^^
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= note: the traits must be derived, manual `impl`s are not sufficient
= note: see https://doc.rust-lang.org/stable/std/marker/trait.StructuralEq.html for details
error: aborting due to 1 previous error
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