[Proposal] #exclude_from_comparison attribute

[KalitaAlexey]

Let's consider the struct

struct List {
    name: String,    
    items: RefCell<Vec<Item>>,
}

Let's consider we need to compare two instances of List. We cannot use #[derive] to implement comparison, because RefCell has no impl for comparison. If we want to compare with name field we must manually implement all required traits.
I suggest #[exclude_from_comparison] attribute.
If I had the #[exclude_from_comparison] attribute, then I will write

#[derive(PartialEq)]
#[derive(Eq)]
#[derive(PartialOrd)]
#[derive(Ord)]
struct List {
    name: String,
    #[exclude_from_comparison]
    items: RefCell<Vec<Item>>,
}

[apasel422]

See also rust-lang/rust#8258.

[KalitaAlexey]

Seen. I got it.