Potential fix for some random errors about "cannot choose between equals invoke functions".

compiler/testData/integration/ant/jvm/valWithInvoke/build.log.expected

@@ -0,0 +1,11 @@
+OUT:
+Buildfile: [TestData]/build.xml
+
+build:
+  [kotlinc] Compiling [[TestData]/test.kt] => [[Temp]/test.jar]
+     [exec] 6
+
+BUILD SUCCESSFUL
+Total time: [time]
+
+Return code: 0

compiler/testData/integration/ant/jvm/valWithInvoke/build.xml

@@ -0,0 +1,12 @@
+<project name="Ant Task Test" default="build">
+    <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlin.lib}/kotlin-ant.jar"/>
+
+    <target name="build">
+        <kotlinc src="${test.data}/test.kt" classpath="${test.data}/valInside.jar" output="${temp}/test.jar" nowarn="true" />
+
+        <exec executable="java">
+            <arg line="-classpath ${temp}/test.jar bar.TestKt"/>
+        </exec>
+    </target>
+
+</project>

compiler/testData/integration/ant/jvm/valWithInvoke/test.kt

@@ -0,0 +1,10 @@
+package bar
+
+@Suppress("REDECLARATION")
+val foo: Int = 6
+
+operator fun Int.invoke() = this
+
+fun main(args: Array<String>) {
+    println(foo())
+}