{"ast_node_type":"variable","tokens":[{"end":41,"kind":"keyword","start":0,"text":"let"}]}
                let [unique_ptr, alloc] =
                assert_eq!(v.layout().fields.count(), 2, "`Box` must have exactly 2 fields");
                    self.ecx().project_fields(v, [FieldIdx::ZERO, FieldIdx::ONE])?;