[Tests] Try structured concurrency with context receivers

compiler/testData/codegen/box/extensionFunctions/contextReceivers/fromKEEP/structuredConcurrency.kt

@@ -0,0 +1,41 @@
+// !LANGUAGE: +ContextReceivers
+// TARGET_BACKEND: JVM_IR
+// IGNORE_BACKEND_FIR: JVM_IR
+// WITH_RUNTIME
+// WITH_COROUTINES
+
+import helpers.*
+import kotlin.coroutines.*
+import kotlin.coroutines.intrinsics.*
+
+interface CoroutineScope
+object MyCoroutineScope : CoroutineScope
+
+interface Flow<out T> {
+    suspend fun collect(): String
+}
+
+inline fun <T : Any> flow(crossinline block: suspend () -> String) = object : Flow<T> {
+    override suspend fun collect(): String = block()
+}
+
+fun CoroutineScope.launch(c: suspend () -> String): String {
+    var result: String = "fail"
+    c.startCoroutine(handleResultContinuation { value ->
+        result = value
+    })
+    return result
+}
+
+context(CoroutineScope)
+fun <T> Flow<T>.launchFlow() = launch { collect() }
+
+fun simpleFlow(): Flow<String> = flow {
+    "OK"
+}
+
+fun box(): String {
+    return with(MyCoroutineScope) {
+        simpleFlow().launchFlow()
+    }
+}