{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"///"}]}
    /// was unexpectedly found to be a subset of another placeholder origin `'b`, and means in NLL
    /// of NLL's "checking if any region constraints were too strong": a placeholder origin `'a`
    /// terms that the "longer free region" `'a` outlived the "shorter free region" `'b`.