kotlin/compiler/testData/codegen/controlStructures/ifBlock.kt

import java.util.*

fun concat(l: List<String>): String? {
    val sb = StringBuilder()
    for(s in l) {
        val x = if(l.size > 1) { "T" } else { "F" };
        sb.append(x)
    }
    return sb.toString()
}