abstract class Multiplier implements TransformAction<TransformParameters.None> {
                private final boolean showOutput = System.getProperty("showOutput") != null
                private final String target

                Multiplier(String target) {
                    if (showOutput) {
                        println("Creating multiplier")
                    }
                    this.target = target

	return keep
}

const (
	CheckExit = 1 << iota
	ShowOutput
	Background
)

var outputLock sync.Mutex

// run is like runEnv with no additional environment.
func run(dir string, mode int, cmd ...string) string {
	return runEnv(dir, mode, nil, cmd...)
}

// runEnv runs the command line cmd in dir with additional environment env.
// If mode has ShowOutput set and Background unset, run passes cmd's output to

	setNoOpt()
	goldflags = os.Getenv("GO_LDFLAGS") // we were using $BOOT_GO_LDFLAGS until now
	goBootstrap := pathf("%s/go_bootstrap", tooldir)
	if debug {
		run("", ShowOutput|CheckExit, pathf("%s/compile", tooldir), "-V=full")
		copyfile(pathf("%s/compile1", tooldir), pathf("%s/compile", tooldir), writeExec)
	}

	// To recap, so far we have built the new toolchain

	}
	if vflag > 0 {
		cmd = append(cmd, "-v")
	}
	if tool := os.Getenv("GOBOOTSTRAP_TOOLEXEC"); tool != "" {
		cmd = append(cmd, "-toolexec="+tool)
	}
	cmd = append(cmd, "bootstrap/cmd/...")
	run(base, ShowOutput|CheckExit, cmd...)

	// Copy binaries into tool binary directory.
	for _, name := range bootstrapDirs {
		if !strings.HasPrefix(name, "cmd/") {
			continue
		}
		name = name[len("cmd/"):]

					have[file] = true
				}
			}
			if have[file] {
				continue
			}
		}
		files = append(files, file)
	}
	return files
}

// Desc returns the package "description", for use in b.showOutput.
func (p *Package) Desc() string {
	if p.ForTest != "" {
		return p.ImportPath + " [" + p.ForTest + ".test]"
	}
	if p.Internal.ForMain != "" {
		return p.ImportPath + " [" + p.Internal.ForMain + "]"
	}