defer os.Remove(dst.Name())
	dst.Chmod(0500) // make executable

	// Clobber all the non-v1 opcodes.
	opcodes := map[string]bool{}
	var features []string
	for feature, opcodeList := range featureToOpcodes {
		if runtimeFeatures[feature] {
			features = append(features, fmt.Sprintf("cpu.%s=off", feature))
		}
		for _, op := range opcodeList {
			opcodes[op] = true
		}
	}
	clobber(t, os.Args[0], dst, opcodes)