{"ast_node_type":"variable","tokens":[{"end":75,"kind":"keyword","start":0,"text":"let"}]}
        let qpath = hir::QPath::LangItem(lang_item, self.lower_span(span));
    ) -> &'hir hir::Pat<'hir> {
        self.pat(span, hir::PatKind::Struct(qpath, fields, false))