Minor: add test to call callable references from Java

compiler/testData/codegen/box/coroutines/featureIntersection/callableReference/fromJava.kt

@@ -0,0 +1,33 @@
+// IGNORE_BACKEND: JS, JS_IR, NATIVE
+// COMMON_COROUTINES_TEST
+// WITH_COROUTINES
+// WITH_REFLECT
+
+// FILE: test.kt
+import kotlin.reflect.KSuspendFunction0
+
+class Test {
+    suspend fun o() = "O"
+    fun forCall(): KSuspendFunction0<String> {
+        return ::o
+    }
+
+    suspend fun k() = "K"
+    fun forInvoke(): SuspendFunction0<String> {
+        return ::k
+    }
+}
+
+// FILE: Checker.java
+import helpers.*;
+
+class Checker {
+    public static String check() {
+        Test test = new Test();
+        return ((String) test.forCall().call(new EmptyContinuation())) +
+                ((String) test.forInvoke().invoke(new EmptyContinuation()));
+    }
+}
+
+// FILE: box.kt
+fun box() = Checker.check()

compiler/testData/codegen/box/reflection/modifiers/functions.kt

@@ -12,8 +12,7 @@ inline fun inline() {}
 class External { external fun external() }
 operator fun Unit.invoke() {}
 infix fun Unit.infix(unit: Unit) {}
-// TODO: support or prohibit references to suspend functions
-// class Suspend { suspend fun suspend(c: Continuation<Unit>) {} }
+class Suspend { suspend fun suspend() {} }
 
 val externalGetter = Unit
     external get
@@ -47,11 +46,11 @@ fun box(): String {
     assertTrue(Unit::infix.isInfix)
     assertFalse(Unit::infix.isSuspend)
 
-//    assertFalse(Suspend::suspend.isInline)
-//    assertFalse(Suspend::suspend.isExternal)
-//    assertFalse(Suspend::suspend.isOperator)
-//    assertFalse(Suspend::suspend.isInfix)
-//    assertTrue(Suspend::suspend.isSuspend)
+    assertFalse(Suspend::suspend.isInline)
+    assertFalse(Suspend::suspend.isExternal)
+    assertFalse(Suspend::suspend.isOperator)
+    assertFalse(Suspend::suspend.isInfix)
+    assertTrue(Suspend::suspend.isSuspend)
 
     assertTrue(::externalGetter.getter.isExternal)
     assertFalse(::externalGetter.getter.isInline)