| fun stringPlus(x: String?, y: Any?) = x.plus(y) | |
| fun box(): String { | |
| val t1 = stringPlus("a", "b") | |
| if (t1 != "ab") return "Failed: t1=$t1" | |
| val t2 = stringPlus("a", null) | |
| if (t2 != "anull") return "Failed: t2=$t2" | |
| val t3 = stringPlus(null, "b") | |
| if (t3 != "nullb") return "Failed: t3=$t3" | |
| val t4 = stringPlus(null, null) | |
| if (t4 != "nullnull") return "Failed: t4=$t4" | |
| return "OK" | |
| } |