{"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":".ok_or_else(oob)?"}]}
                    .ok_or_else(oob)?
                    .get_mut(dst..dst + r.size)
                    .copy_from_slice(self.heap.get(src..src + r.size).ok_or_else(oob)?);