diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiUtil.java b/compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiUtil.java
index 0c44160a992..3d828b01f86 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiUtil.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPsiUtil.java
@@ -2,6 +2,7 @@ package org.jetbrains.jet.lang.psi;
 
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.jet.lexer.JetTokens;
 
 import java.util.Collection;
 import java.util.HashSet;
@@ -13,11 +14,25 @@ import java.util.Set;
 public class JetPsiUtil {
     @Nullable
     public static JetExpression deparenthesize(@NotNull JetExpression expression) {
-        JetExpression result = expression;
-        while (result instanceof JetParenthesizedExpression) {
-            result = ((JetParenthesizedExpression) expression).getExpression();
+        if (expression instanceof JetBinaryExpressionWithTypeRHS) {
+            JetSimpleNameExpression operationSign = ((JetBinaryExpressionWithTypeRHS) expression).getOperationSign();
+            if (JetTokens.COLON.equals(operationSign.getReferencedNameElementType())) {
+                expression = ((JetBinaryExpressionWithTypeRHS) expression).getLeft();
+            }
         }
-        return result;
+        else if (expression instanceof JetPrefixExpression) {
+            if (JetTokens.LABELS.contains(((JetPrefixExpression) expression).getOperationSign().getReferencedNameElementType())) {
+                JetExpression baseExpression = ((JetPrefixExpression) expression).getBaseExpression();
+                if (baseExpression != null) {
+                    expression = baseExpression;
+                }
+            }
+        }
+        if (expression instanceof JetParenthesizedExpression) {
+            JetExpression innerExpression = ((JetParenthesizedExpression) expression).getExpression();
+            return innerExpression != null ? deparenthesize(innerExpression) : null;
+        }
+        return expression;
     }
 
     @NotNull
diff --git a/compiler/testData/checkerWithErrorTypes/quick/LValueAssignment.jet b/compiler/testData/checkerWithErrorTypes/quick/LValueAssignment.jet
index 6702808b0d8..a5e989ec001 100644
--- a/compiler/testData/checkerWithErrorTypes/quick/LValueAssignment.jet
+++ b/compiler/testData/checkerWithErrorTypes/quick/LValueAssignment.jet
@@ -32,7 +32,27 @@ class D() {
     }
 }
 
-fun cannotBe() {
+fun cannotBe(var i: Int) {
     <!UNRESOLVED_REFERENCE!>z<!> = 30;
     <!VARIABLE_EXPECTED!>()<!> = ();
+
+    (<!VARIABLE_EXPECTED!>i <!USELESS_CAST!>as<!> Int<!>) = 34
+    (<!VARIABLE_EXPECTED!>i is Int<!>) = false
+    <!VARIABLE_EXPECTED!>A()<!> = A()
+    <!VARIABLE_EXPECTED!>5<!> = 34
+}
+
+fun canBe(var i: Int, val j: Int) {
+    (i: Int) = 36
+    (@label i) = 34
+
+    (<!VAL_REASSIGNMENT!>j<!>: Int) = 36
+    (@label <!VAL_REASSIGNMENT!>j<!>) = 34
+
+    val a = A()
+    (@ a.a) = 3894
+}
+
+class A() {
+    var a: Int = 3
 }