{"ast_node_type":"function","tokens":[{"end":89,"kind":"keyword","start":0,"text":"pub(crate)"}]}
    pub(crate) fn demand_suptype(&self, sp: Span, expected: Ty<'tcx>, actual: Ty<'tcx>) {
    /// they don't.
        if let Err(e) = self.demand_suptype_diag(sp, expected, actual) {