error[E0369]: binary operation `==` cannot be applied to type `Vec` --> $DIR/eq-vec.rs:11:5 | LL | assert_eq!(vec1, vec2); | ^^^^^^^^^^^^^^^^^^^^^^ | | | Vec | Vec | note: an implementation of `PartialEq` might be missing for `Foo` --> $DIR/eq-vec.rs:3:5 | LL | enum Foo { | ^^^^^^^^ must implement `PartialEq` = note: this error originates in the macro `assert_eq` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider annotating `Foo` with `#[derive(PartialEq)]` | LL + #[derive(PartialEq)] LL | enum Foo { | error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0369`.