//
	// a := &s
	// ptr, len, cap := s
	// len += 3
	// if uint(len) > uint(cap) {
	//    ptr, len, cap = growslice(ptr, len, cap, 3, typ)
	//    vardef(a)    // if necessary, advise liveness we are writing a new a
	//    *a.cap = cap // write before ptr to avoid a spill
	//    *a.ptr = ptr // with write barrier
	// }
	// *a.len = len
	// // with write barriers, if needed: