{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"let"}]}
                    let (size, _) = self.size_align_of_unsized(ty, metadata, locals)?;
                    let metadata = arg.interval.slice(self.ptr_size()..self.ptr_size() * 2);
                    destination.write_from_bytes(self, &size.to_le_bytes())