kotlin-fork/compiler/testData/codegen/box/controlStructures/forInCharSequence.kt

// DONT_TARGET_EXACT_BACKEND: WASM
// WASM_MUTE_REASON: STDLIB_STRING_BUILDER
// KJS_WITH_FULL_RUNTIME
// WITH_RUNTIME

fun box(): String {
    var s = ""
    for (c in StringBuilder("OK")) {
        s += c
    }
    return s
}