get() = section.wholeRange

    internal
    val identifierString: String
        get() = source.text.substring(range)

    internal
    val blockString: String
        get() = source.text.substring(section.block)

    override fun equals(other: Any?): Boolean = other is ProgramSourceFragment && other.identifierString == identifierString && other.blockString == blockString

    override fun hashCode(): Int {