Equality of array and vector is not symmetric

1

Hi, folks,

I bumped into this today where equality of array and vec is not symmetric. The code below doesn't compile, but if you reverse it to say b == a then it does compile.

This is quite surprising to me. There is a mention here: rust/partial_eq.rs at e4c23daeb461ac02413eb36c8cefcc5530638a05 · rust-lang/rust · GitHub

about code bloat, but is that true anymore with the latest "const generics"?

Thanks.


fn main() {

    let a = [1, 2, 3];
    let b = vec![1, 2, 3];
    
    let c = a == b;
    
    println!("a: {:?}", a);
    println!("b: {:?}", b);
    println!("c: {:?}", c);
}

(Playground)

1 Like
2

True, it shouldn't be so bad anymore -- could be worth trying it!

3

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