diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintPosition.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintPosition.java
new file mode 100644
index 00000000000..860abed1438
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+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintPosition.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2010-2012 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.jet.lang.resolve.calls.inference;
+
+import com.google.common.collect.Maps;
+
+import java.util.Map;
+
+/**
+ * @author svtk
+ */
+public abstract class ConstraintPosition {
+    public static final ConstraintPosition RECEIVER_POSITION = new ConstraintPosition() {};
+    public static final ConstraintPosition EXPECTED_TYPE_POSITION = new ConstraintPosition() {};
+
+    private static final Map<Integer, ValueParameterPosition> valueParameterPositions = Maps.newHashMap();
+
+    public static ConstraintPosition valueParameterPosition(int index) {
+        ValueParameterPosition position = valueParameterPositions.get(index);
+        if (position == null) {
+            position = new ValueParameterPosition(index);
+            valueParameterPositions.put(index, position);
+        }
+        return position;
+    }
+
+    private static class ValueParameterPosition extends ConstraintPosition {
+        private final int index;
+
+        private ValueParameterPosition(int index) {
+            this.index = index;
+        }
+
+        public int getIndex() {
+            return index;
+        }
+    }
+}