diff --git a/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/AssignedVariablesSearcher.kt b/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/AssignedVariablesSearcher.kt
new file mode 100644
index 00000000000..afa606cb2be
--- /dev/null
+++ b/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/AssignedVariablesSearcher.kt
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.types.expressions
+
+import org.jetbrains.kotlin.lexer.JetTokens
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.psi.JetBinaryExpression
+import org.jetbrains.kotlin.psi.JetNameReferenceExpression
+import org.jetbrains.kotlin.psi.JetPsiUtil
+import org.jetbrains.kotlin.psi.JetTreeVisitorVoid
+import java.util.*
+
+abstract class AssignedVariablesSearcher: JetTreeVisitorVoid() {
+
+    protected val assignedNames: MutableSet<Name> = LinkedHashSet()
+
+    override fun visitBinaryExpression(binaryExpression: JetBinaryExpression) {
+        if (binaryExpression.operationToken === JetTokens.EQ) {
+            val left = JetPsiUtil.deparenthesize(binaryExpression.left)
+            if (left is JetNameReferenceExpression) {
+                assignedNames += left.getReferencedNameAsName()
+            }
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/PreliminaryLoopVisitor.java b/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/PreliminaryLoopVisitor.java
index 18b76ffae4c..b5e99e035f6 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/PreliminaryLoopVisitor.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/PreliminaryLoopVisitor.java
@@ -18,8 +18,6 @@ package org.jetbrains.kotlin.types.expressions;
 
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.kotlin.descriptors.impl.LocalVariableDescriptor;
-import org.jetbrains.kotlin.lexer.JetTokens;
-import org.jetbrains.kotlin.name.Name;
 import org.jetbrains.kotlin.psi.*;
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfo;
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowValue;
@@ -31,20 +29,11 @@ import java.util.*;
  * The purpose of this class is to find all variable assignments
  * <b>before</b> loop analysis
  */
-class PreliminaryLoopVisitor extends JetTreeVisitor<Void> {
-
-    // loop under analysis
-    private final JetLoopExpression loopExpression;
-
-    private final Set<Name> assignedNames = new LinkedHashSet<Name>();
-
-    private PreliminaryLoopVisitor(@NotNull JetLoopExpression loopExpression) {
-        this.loopExpression = loopExpression;
-    }
+class PreliminaryLoopVisitor extends AssignedVariablesSearcher {
 
     @NotNull
     static public PreliminaryLoopVisitor visitLoop(@NotNull JetLoopExpression loopExpression) {
-        PreliminaryLoopVisitor visitor = new PreliminaryLoopVisitor(loopExpression);
+        PreliminaryLoopVisitor visitor = new PreliminaryLoopVisitor();
         loopExpression.accept(visitor, null);
         return visitor;
     }
@@ -57,7 +46,7 @@ class PreliminaryLoopVisitor extends JetTreeVisitor<Void> {
             // Only uncaptured local variables are under interest here
             if (value.isUncapturedLocalVariable() && value.getId() instanceof LocalVariableDescriptor) {
                 LocalVariableDescriptor descriptor = (LocalVariableDescriptor)value.getId();
-                if (assignedNames.contains(descriptor.getName())) {
+                if (getAssignedNames().contains(descriptor.getName())) {
                     valueSetToClear.add(value);
                 }
             }
@@ -67,17 +56,4 @@ class PreliminaryLoopVisitor extends JetTreeVisitor<Void> {
         }
         return dataFlowInfo;
     }
-
-    @Override
-    public Void visitBinaryExpression(@NotNull JetBinaryExpression binaryExpression, Void arg) {
-        if (binaryExpression.getOperationToken() == JetTokens.EQ) {
-            JetExpression left = JetPsiUtil.deparenthesize(binaryExpression.getLeft());
-            if (left instanceof JetNameReferenceExpression) {
-                // deparenthesize
-                assignedNames.add(((JetNameReferenceExpression) left).getReferencedNameAsName());
-            }
-        }
-        return null;
-    }
-
 }