Node in rustc_data_structures::obligation_forest - Rust (original) (raw)

struct Node<O> {
    obligation: O,
    state: Cell<NodeState>,
    dependents: Vec<usize>,
    has_parent: bool,
    obligation_tree_id: ObligationTreeId,
}

Obligations that depend on this obligation for their completion. They must all be in a non-pending state.

If true, dependents[0] points to a “parent” node, which requires special treatment upon error but is otherwise treated the same. (It would be more idiomatic to store the parent node in a separateOption<usize> field, but that slows down the common case of iterating over the parent and other descendants together.)

Identifier of the obligation tree to which this node belongs.

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.