{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"//"}]}
                    // Only `repr(C)` types can be compared structurally.
                (&ty::Adt(a_def, a_gen_args), &ty::Adt(b_def, b_gen_args)) => {
                    if !(a_def.repr().c() && b_def.repr().c()) {