test for already fixed KT-1726

compiler/testData/codegen/regressions/kt1726.kt

@@ -0,0 +1,15 @@
+class Foo(
+        var state : Int,
+        val f : (Int) -> Int){
+
+    fun next() : Int {
+        val nextState = f(state)
+        state = nextState
+        return state
+    }
+}
+
+fun box(): String {
+    val f = Foo(23, {x -> 2 * x})
+    return if (f.next() == 46) "OK" else "fail"
+}

compiler/tests/org/jetbrains/jet/codegen/ClassGenTest.java

@@ -406,4 +406,9 @@ public class ClassGenTest extends CodegenTestCase {
         createEnvironmentWithMockJdkAndIdeaAnnotations(CompilerSpecialMode.JDK_HEADERS);
         blackBoxFile("regressions/kt1578.kt");
     }
+
+    public void testKt1726() throws Exception {
+        createEnvironmentWithMockJdkAndIdeaAnnotations(CompilerSpecialMode.JDK_HEADERS);
+        blackBoxFile("regressions/kt1726.kt");
+    }
 }