Enum rustc_mir::borrow_check::Overlap

pub(in borrow_check) enum Overlap {
    Arbitrary,
    EqualOrDisjoint,
    Disjoint,
}

The degree of overlap between 2 places for borrow-checking.

Variants

Arbitrary

The places might partially overlap - in this case, we give up and say that they might conflict. This occurs when different fields of a union are borrowed. For example, if u is a union, we have no way of telling how disjoint u.a.x and a.b.y are.

EqualOrDisjoint

The places have the same type, and are either completely disjoint or equal - i.e., they can't "partially" overlap as can occur with unions. This is the "base case" on which we recur for extensions of the place.

Disjoint

The places are disjoint, so we know all extensions of them will also be disjoint.