stack/stack.go
func (f *Func) PkgName() string {
	parts := strings.SplitN(filepath.Base(f.Raw), ".", 2)
	if len(parts) == 1 {
		return ""
	}
	s, _ := url.QueryUnescape(parts[0])
	return s
}
func (f *Func) PkgName() string {
	parts := strings.SplitN(filepath.Base(f.Raw), ".", 2)
	if len(parts) == 1 {
		return ""
	}
	s, _ := url.QueryUnescape(parts[0])
	return s
}
// PkgName is the package name for this function reference.