{"ast_node_type":"variable","tokens":[{"end":68,"kind":"keyword","start":0,"text":"let"}]}
                let (a_size, b_size) = (a.size(self), b.size(self));
                // which `ptr.offset(b_offset)` cannot possibly fail to satisfy.
                let b_offset = a_size.align_to(b.align(self).abi);