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error[E0277]: the trait bound `PartialEqNotEq: Eq` is not satisfied
--> $DIR/union-derive-eq.rs:16:5
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LL | #[derive(Eq)]
| -- in this derive macro expansion
LL | union U2 {
LL | a: PartialEqNotEq,
| ^^^^^^^^^^^^^^^^^ the trait `Eq` is not implemented for `PartialEqNotEq`
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note: required by a bound in `AssertParamIsEq`
--> $SRC_DIR/core/src/cmp.rs:LL:COL
= note: this error originates in the derive macro `Eq` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider annotating `PartialEqNotEq` with `#[derive(Eq)]`
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LL + #[derive(Eq)]
LL | struct PartialEqNotEq;
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error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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