val source = ProgramSource(
            "build.gradle.kts",
            """
                plugins { println("stage 1") }
                print("stage 2")
            """.replaceIndent()
        )

        val fragment = source.fragment(0..6, 8..29)
        val stage1 = Program.Plugins(fragment)
        val stage2 = source.map { it.erase(listOf(fragment.range)) }