{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"///"}]}
    /// already being constrained to `Vec<?y>`, then the first evaluation resolves it to
    /// when reevaluating ambiguous goals. E.g. if we've got a goal `?x: Trait` with `?x`
    /// `Vec<?y>: Trait`. If this goal is still ambiguous and we later resolve `?y` to `u32`,