case 2:
		// Package must be findable and importable.
		pkg, err := build.Import(args[0], wd, build.ImportComment)
		if err == nil {
			return pkg, args[0], args[1], false
		}
		for {
			packagePath, ok := findNextPackage(arg)
			if !ok {
				break
			}
			if pkg, err := build.ImportDir(packagePath, build.ImportComment); err == nil {
				return pkg, arg, args[1], true
			}
		}
		return nil, args[0], args[1], false

pkg encoding/xml, method (*Decoder) InputOffset() int64

# CL 124940043 cmd/go, go/build: implement import comment checking, Russ Cox <******@****.***>
pkg go/build, const ImportComment = 4
pkg go/build, const ImportComment ImportMode
pkg go/build, type Package struct, ImportComment string

# CL 155050043 go/build: Return MultiplePackageError on importing a dir containing multiple packages, Jens Frederich <******@****.***>

// pkg.build.ImportPath is sometimes the unhelpful "" or ".", it looks for a
// directory name in GOROOT or GOPATH if that happens.
func (pkg *Package) prettyPath() string {
	path := pkg.build.ImportComment
	if path == "" {
		path = pkg.build.ImportPath
	}
	if path != "." && path != "" {
		return path
	}
	// Convert the source directory into a more useful path.

    type Package struct {
        Dir            string   // directory containing package sources
        ImportPath     string   // import path of package in dir
        ImportComment  string   // path in import comment on package statement
        Name           string   // package name
        Doc            string   // package documentation string
        Target         string   // install path

	if shlib != "" {
		gorootInstallDir = filepath.Dir(shlib)
	}

	myContext.InstallSuffix = "_dynlink"
	depP, err := myContext.Import("./depBase", ".", build.ImportComment)
	if err != nil {
		return 0, fmt.Errorf("import failed: %v", err)
	}
	if depP.PkgTargetRoot == "" {
		gopathInstallDir = filepath.Dir(goCmd(nil, "list", "-buildmode=shared", "-f", "{{.Target}}", "./depBase"))