rb_struct_size    620 struct.c       rb_struct_size(VALUE s);
rb_struct_size    625 struct.c           return rb_struct_size(s);
rb_struct_size   1203 struct.c           rb_define_method(rb_cStruct, "size", rb_struct_size, 0);
rb_struct_size   1204 struct.c           rb_define_method(rb_cStruct, "length", rb_struct_size, 0);