KT-13658: don't capture FakeCallableDescriptorForObject in closure

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/ClosureTest.java

@@ -191,4 +191,8 @@ public final class ClosureTest extends SingleFileTranslationTest {
     public void testLambdaInLocalFun() throws Exception {
         checkFooBoxIsOk();
     }
+
+    public void testObjectWithInvokeOperator() throws Exception {
+        checkFooBoxIsOk();
+    }
 }

js/js.translator/src/org/jetbrains/kotlin/js/translate/context/UsageTracker.kt

@@ -22,6 +22,7 @@ import org.jetbrains.kotlin.js.translate.utils.ManglingUtils.getSuggestedName
 import com.google.dart.compiler.backend.js.ast.JsScope
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.DescriptorUtils.*
+import org.jetbrains.kotlin.resolve.calls.util.FakeCallableDescriptorForObject
 
 private val CAPTURED_RECEIVER_NAME_PREFIX : String = "this$"
 
@@ -43,6 +44,8 @@ class UsageTracker(
     fun used(descriptor: DeclarationDescriptor) {
         if (isCaptured(descriptor)) return
 
+        if (descriptor is FakeCallableDescriptorForObject) return
+
         // local named function
         if (descriptor is FunctionDescriptor && descriptor.visibility == Visibilities.LOCAL) {
             assert(!descriptor.getName().isSpecial) { "Function with special name can not be captured, descriptor: $descriptor" }

js/js.translator/testData/closure/cases/objectWithInvokeOperator.kt

@@ -0,0 +1,36 @@
+package foo
+
+object O {
+    val result = "O"
+}
+
+operator fun O.invoke() = result
+
+
+class A(val x: Int) {
+    companion object {
+        val result = "A"
+    }
+}
+
+operator fun A.Companion.invoke() = result
+
+
+enum class B {
+    E {
+        val result = "B"
+
+        override operator fun invoke() = result
+    };
+
+    abstract operator fun invoke(): String
+}
+
+fun f() = { O() + A() + B.E() }
+
+fun box(): String {
+    val result = f()()
+    if (result != "OAB") return "expected 'OAB', got '$result'"
+
+    return "OK"
+}