Add test for KT-48478

compiler/testData/codegen/box/callableReference/adaptedReferences/suspendUnitConversion.kt

@@ -0,0 +1,22 @@
+// WITH_COROUTINES
+// WITH_RUNTIME
+// IGNORE_BACKEND: WASM
+import helpers.*
+import kotlin.coroutines.*
+import kotlin.coroutines.intrinsics.*
+
+suspend fun foo(x: suspend () -> Unit) = x()
+
+suspend fun bar(): Int = suspendCoroutineUninterceptedOrReturn<Int> {
+    it.resume(1)
+    COROUTINE_SUSPENDED
+}
+
+fun box(): String {
+    var result = ""
+    suspend {
+        foo(::bar)
+        result += "OK"
+    }.startCoroutine(EmptyContinuation)
+    return result
+}