return true
	}
	rune, _ := utf8.DecodeRuneInString(name[len(prefix):])
	return !unicode.IsLower(rune)
}

// playExample synthesizes a new *ast.File based on the provided
// file with the provided function body as the body of main.
func playExample(file *ast.File, f *ast.FuncDecl) *ast.File {
	body := f.Body

	if !strings.HasSuffix(file.Name.Name, "_test") {