{"ast_node_type":"variable","tokens":[{"end":53,"kind":"keyword","start":0,"text":"let"}]}
        let field = self.single_pat_field(span, pat);
    fn pat_some(&mut self, span: Span, pat: &'hir hir::Pat<'hir>) -> &'hir hir::Pat<'hir> {
        self.pat_lang_item_variant(span, hir::LangItem::OptionSome, field)