{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"///"}]}
    /// for diagnostics. If `r` contains multiple disjoint universal regions
    /// Like `universal_upper_bound`, but returns an approximation more suitable
    /// (e.g. 'a and 'b in `fn foo<'a, 'b> { ... }`, we pick the lower-numbered region.