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 + "]"
	}