diff --git a/compiler/testData/checker/Unresolved.jet b/compiler/testData/checker/Unresolved.jet
index 9e361861010..2d56e915eb7 100644
--- a/compiler/testData/checker/Unresolved.jet
+++ b/compiler/testData/checker/Unresolved.jet
@@ -22,8 +22,9 @@ fun testUnresolved() {
 
     //TODO
     for (j in <error>collection</error>) {
-       val i: Int = j
-       j += 1
+       var i: Int = j
+       i += 1
+       foo1(j)
     }
 }
 
diff --git a/compiler/testData/checker/regression/Jet183-1.jet b/compiler/testData/checker/regression/Jet183-1.jet
index 37c72d83ef6..0199cd9fcb3 100644
--- a/compiler/testData/checker/regression/Jet183-1.jet
+++ b/compiler/testData/checker/regression/Jet183-1.jet
@@ -12,7 +12,7 @@ abstract enum class ProtocolState {
 
 
 fun box(): String {
-   val x: ProtocolState = ProtocolState.WAITING
+   var x: ProtocolState = ProtocolState.WAITING
    x = x.signal()
    if (x != ProtocolState.TALKING) return "fail 1"
    x = x.signal()
diff --git a/compiler/testData/checkerWithErrorTypes/full/FunctionReturnTypes.jet b/compiler/testData/checkerWithErrorTypes/full/FunctionReturnTypes.jet
index 646a38f5b89..68b1803449f 100644
--- a/compiler/testData/checkerWithErrorTypes/full/FunctionReturnTypes.jet
+++ b/compiler/testData/checkerWithErrorTypes/full/FunctionReturnTypes.jet
@@ -176,23 +176,23 @@ fun testFunctionLiterals() {
     }
 
     val endsWithAssignment = { () : Int =>
-        val x = 1
+        var x = 1
         <!EXPECTED_TYPE_MISMATCH!>x = 333<!>
     }
 
     val endsWithReAssignment = { () : Int =>
-        val x = 1
+        var x = 1
         <!EXPECTED_TYPE_MISMATCH!>x += 333<!>
     }
 
     val endsWithFunDeclaration : fun() : String = {
-        val x = 1
+        var x = 1
         x = 333
         <!EXPECTED_TYPE_MISMATCH!>fun meow() : Unit {}<!>
     }
 
     val endsWithObjectDeclaration : fun() : Int = {
-        val x = 1
+        var x = 1
         x = 333
         <!EXPECTED_TYPE_MISMATCH!>object A {}<!>
     }
diff --git a/compiler/testData/checkerWithErrorTypes/full/Unresolved.jet b/compiler/testData/checkerWithErrorTypes/full/Unresolved.jet
index 48ea2a58e4d..9bd749a8372 100644
--- a/compiler/testData/checkerWithErrorTypes/full/Unresolved.jet
+++ b/compiler/testData/checkerWithErrorTypes/full/Unresolved.jet
@@ -22,8 +22,9 @@ fun testUnresolved() {
 
     //TODO
     for (j in <!UNRESOLVED_REFERENCE!>collection<!>) {
-       val i: Int = j
-       j += 1
+       var i: Int = j
+       i += 1
+       foo1(j)
     }
 }
 
diff --git a/compiler/testData/checkerWithErrorTypes/full/regression/Jet183-1.jet b/compiler/testData/checkerWithErrorTypes/full/regression/Jet183-1.jet
index 37c72d83ef6..0199cd9fcb3 100644
--- a/compiler/testData/checkerWithErrorTypes/full/regression/Jet183-1.jet
+++ b/compiler/testData/checkerWithErrorTypes/full/regression/Jet183-1.jet
@@ -12,7 +12,7 @@ abstract enum class ProtocolState {
 
 
 fun box(): String {
-   val x: ProtocolState = ProtocolState.WAITING
+   var x: ProtocolState = ProtocolState.WAITING
    x = x.signal()
    if (x != ProtocolState.TALKING) return "fail 1"
    x = x.signal()
diff --git a/compiler/testData/codegen/classes/overloadPlusAssign.jet b/compiler/testData/codegen/classes/overloadPlusAssign.jet
index 21459ecff1e..5247973e8d6 100644
--- a/compiler/testData/codegen/classes/overloadPlusAssign.jet
+++ b/compiler/testData/codegen/classes/overloadPlusAssign.jet
@@ -17,7 +17,7 @@ class ArrayWrapper<T>() {
 }
 
 fun box(): String {
-    val v1 = ArrayWrapper<String>()
+    var v1 = ArrayWrapper<String>()
     val v2 = ArrayWrapper<String>()
     v1.add("foo")
     v2.add("bar")
diff --git a/compiler/testData/codegen/classes/overloadPlusAssignReturn.jet b/compiler/testData/codegen/classes/overloadPlusAssignReturn.jet
index 28fb9af2652..42671b9f138 100644
--- a/compiler/testData/codegen/classes/overloadPlusAssignReturn.jet
+++ b/compiler/testData/codegen/classes/overloadPlusAssignReturn.jet
@@ -20,7 +20,7 @@ class ArrayWrapper<T>() {
 }
 
 fun box(): String {
-    val v1 = ArrayWrapper<String>()
+    var v1 = ArrayWrapper<String>()
     val v2 = ArrayWrapper<String>()
     v1.add("foo")
     val v3 = v1
diff --git a/compiler/testData/codegen/classes/overloadPlusToPlusAssign.jet b/compiler/testData/codegen/classes/overloadPlusToPlusAssign.jet
index e81515821b0..c5236b0ace4 100644
--- a/compiler/testData/codegen/classes/overloadPlusToPlusAssign.jet
+++ b/compiler/testData/codegen/classes/overloadPlusToPlusAssign.jet
@@ -20,7 +20,7 @@ class ArrayWrapper<T>() {
 }
 
 fun box(): String {
-    val v1 = ArrayWrapper<String>()
+    var v1 = ArrayWrapper<String>()
     val v2 = ArrayWrapper<String>()
     v1.add("foo")
     val v3 = v1
diff --git a/compiler/testData/codegen/controlStructures/forIntRange.jet b/compiler/testData/codegen/controlStructures/forIntRange.jet
index 0fe391123eb..d215a925bb9 100644
--- a/compiler/testData/codegen/controlStructures/forIntRange.jet
+++ b/compiler/testData/codegen/controlStructures/forIntRange.jet
@@ -4,7 +4,7 @@ fun box() : String {
     a[1] = "b"
     a[2] = "c"
 
-    val result = 0
+    var result = 0
     for(i in a.indices) {
       result += i
     }
diff --git a/compiler/tests/org/jetbrains/jet/codegen/NamespaceGenTest.java b/compiler/tests/org/jetbrains/jet/codegen/NamespaceGenTest.java
index 5c4167442fa..5be2b30adca 100644
--- a/compiler/tests/org/jetbrains/jet/codegen/NamespaceGenTest.java
+++ b/compiler/tests/org/jetbrains/jet/codegen/NamespaceGenTest.java
@@ -268,7 +268,7 @@ public class NamespaceGenTest extends CodegenTestCase {
     }
 
     public void testStringPlusEq() throws Exception {
-        loadText("fun foo(s: String) : String { val result = s; result += s; return result; } ");
+        loadText("fun foo(s: String) : String { var result = s; result += s; return result; } ");
         System.out.println(generateToText());
         final Method main = generateFunction();
         assertEquals("JarJar", main.invoke(null, "Jar"));