{"ast_node_type":"other","tokens":[{"end":85,"kind":"keyword","start":0,"text":"if"}]}
        if self.token.is_keyword(kw::Const) && self.look_ahead(1, |t| t.is_ident()) {
            self.dcx().emit_err(errors::ConstLetMutuallyExclusive { span: lo.to(self.token.span) });