code: func (k LiteralStringKind) FullyEscaped() bool {
  	switch k {
  	case StringSingle, StringDouble:
  		return true
  	case StringBlock, VerbatimStringDouble, VerbatimStringSingle:
  		return false
  	}
  	panic(fmt.Sprintf("Unknown string kind: %v", k))
  }
docs: // FullyEscaped returns true iff the literal string kind may contain escape
  // sequences that require unescaping.