{"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"let"}]}
                let args = self.arena.alloc(hir::GenericArgs {
                let arg = hir::Ty { kind, span, hir_id: self.next_id() };
                    args: self.arena.alloc([hir::GenericArg::Type(self.arena.alloc(arg))]),