{"ast_node_type":"other","tokens":[{"end":22,"kind":"keyword","start":0,"text":"///"}]}
    /// helps explain.
    /// Annotate the provided diagnostic with information about borrow from the fn signature that
    pub(crate) fn emit(&self, cx: &MirBorrowckCtxt<'_, '_, 'tcx>, diag: &mut Diag<'_>) -> String {