diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/CodegenContext.java b/compiler/backend/src/org/jetbrains/jet/codegen/CodegenContext.java
index ce0eb62f800..a1135e9c65c 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/CodegenContext.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/CodegenContext.java
@@ -10,6 +10,7 @@ import org.objectweb.asm.commons.InstructionAdapter;
 
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.LinkedHashMap;
 
 /*
  * @author max
@@ -38,6 +39,8 @@ public abstract class CodegenContext {
     public  final ObjectOrClosureCodegen closure;
     
     HashMap<JetType,Integer> typeInfoConstants;
+    HashMap<Integer,JetType> reverseTypeInfoConstants;
+    int typeInfoConstantsCount;
     HashMap<DeclarationDescriptor, DeclarationDescriptor> accessors;
 
     protected StackValue outerExpression;
@@ -177,13 +180,16 @@ public abstract class CodegenContext {
         if(parentContext != STATIC)
             return parentContext.getTypeInfoConstantIndex(type);
         
-        if(typeInfoConstants == null)
-            typeInfoConstants = new HashMap<JetType, Integer>();
+        if(typeInfoConstants == null) {
+            typeInfoConstants = new LinkedHashMap<JetType, Integer>();
+            reverseTypeInfoConstants = new LinkedHashMap<Integer, JetType>();
+        }
 
         Integer index = typeInfoConstants.get(type);
         if(index == null) {
-            index = typeInfoConstants.size();
+            index = typeInfoConstantsCount++;
             typeInfoConstants.put(type, index);
+            reverseTypeInfoConstants.put(index, type);
         }
         return index;
     }
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java b/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java
index e69555a882b..ea4c1848f16 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/ExpressionCodegen.java
@@ -2068,14 +2068,14 @@ public class ExpressionCodegen extends JetVisitor<StackValue, StackValue> {
         return type;
     }
 
-    private void generateNewArray(JetCallExpression expression, JetType arrayType) {
+    public void generateNewArray(JetCallExpression expression, JetType arrayType) {
         List<? extends ValueArgument> args = expression.getValueArguments();
 
         boolean isArray = state.getStandardLibrary().getArray().equals(arrayType.getConstructor().getDeclarationDescriptor());
         if(isArray) {
-            if (args.size() != 2 && !arrayType.getArguments().get(0).getType().isNullable()) {
-                throw new CompilationException("array constructor of non-nullable type requires two arguments");
-            }
+//            if (args.size() != 2 && !arrayType.getArguments().get(0).getType().isNullable()) {
+//                throw new CompilationException("array constructor of non-nullable type requires two arguments");
+//            }
         }
         else {
             if (args.size() != 1) {
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/NamespaceCodegen.java b/compiler/backend/src/org/jetbrains/jet/codegen/NamespaceCodegen.java
index 908c8d29867..7350a49cdbb 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/NamespaceCodegen.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/NamespaceCodegen.java
@@ -13,8 +13,10 @@ import org.objectweb.asm.Label;
 import org.objectweb.asm.MethodVisitor;
 import org.objectweb.asm.Type;
 import org.objectweb.asm.commons.InstructionAdapter;
+import sun.jvm.hotspot.debugger.LongHashMap;
 
 import java.util.Collections;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 
@@ -114,11 +116,12 @@ public class NamespaceCodegen {
     private void generateTypeInfoFields(JetNamespace namespace, CodegenContext context) {
         if(context.typeInfoConstants != null) {
             String jvmClassName = getJVMClassName(namespace.getName());
-            for(Map.Entry<JetType,Integer> e : (context.typeInfoConstants != null ? context.typeInfoConstants : Collections.<JetType,Integer>emptyMap()).entrySet()) {
-                String fieldName = "$typeInfoCache$" + e.getValue();
+            for(int index = 0; index != context.typeInfoConstantsCount; index++) {
+                JetType type = context.reverseTypeInfoConstants.get(index);
+                String fieldName = "$typeInfoCache$" + index;
                 v.newField(null, ACC_PRIVATE | ACC_STATIC | ACC_SYNTHETIC, fieldName, "Ljet/typeinfo/TypeInfo;", null, null);
 
-                MethodVisitor mmv = v.newMethod(null, ACC_PUBLIC | ACC_STATIC | ACC_SYNTHETIC, "$getCachedTypeInfo$" + e.getValue(), "()Ljet/typeinfo/TypeInfo;", null, null);
+                MethodVisitor mmv = v.newMethod(null, ACC_PUBLIC | ACC_STATIC | ACC_SYNTHETIC, "$getCachedTypeInfo$" + index, "()Ljet/typeinfo/TypeInfo;", null, null);
                 InstructionAdapter v = new InstructionAdapter(mmv);
                 v.visitFieldInsn(GETSTATIC, jvmClassName, fieldName, "Ljet/typeinfo/TypeInfo;");
                 v.visitInsn(DUP);
@@ -126,7 +129,7 @@ public class NamespaceCodegen {
                 v.visitJumpInsn(IFNONNULL, end);
 
                 v.pop();
-                generateTypeInfo(context, v, e.getKey(), state.getTypeMapper(), e.getKey());
+                generateTypeInfo(context, v, type, state.getTypeMapper(), type);
                 v.dup();
 
                 v.visitFieldInsn(PUTSTATIC, jvmClassName, fieldName, "Ljet/typeinfo/TypeInfo;");
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/IntrinsicMethods.java b/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/IntrinsicMethods.java
index a75db2d5a37..e86d46bfb8e 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/IntrinsicMethods.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/IntrinsicMethods.java
@@ -15,6 +15,7 @@ import org.jetbrains.jet.lang.types.JetStandardLibrary;
 import org.jetbrains.jet.lang.types.TypeProjection;
 import org.jetbrains.jet.plugin.JetFileType;
 import org.objectweb.asm.Opcodes;
+import sun.tools.tree.NewArrayExpression;
 
 import java.util.*;
 
@@ -85,6 +86,7 @@ public class IntrinsicMethods {
         declareOverload(myStdLib.getLibraryScope().getFunctions("equals"), 1, EQUALS);
         declareOverload(myStdLib.getLibraryScope().getFunctions("identityEquals"), 1, EQUALS);
         declareOverload(myStdLib.getLibraryScope().getFunctions("plus"), 1, new StringPlus());
+        declareOverload(myStdLib.getLibraryScope().getFunctions("Array"), 1, new NewArray());
 
         declareIntrinsicFunction("ByteIterator", "next", 0, ITERATOR_NEXT);
         declareIntrinsicFunction("ShortIterator", "next", 0, ITERATOR_NEXT);
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/NewArray.java b/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/NewArray.java
new file mode 100644
index 00000000000..318dfcfdf7f
--- /dev/null
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/intrinsics/NewArray.java
@@ -0,0 +1,24 @@
+package org.jetbrains.jet.codegen.intrinsics;
+
+import com.intellij.psi.PsiElement;
+import org.jetbrains.jet.codegen.ExpressionCodegen;
+import org.jetbrains.jet.codegen.JetTypeMapper;
+import org.jetbrains.jet.codegen.StackValue;
+import org.jetbrains.jet.lang.psi.JetCallExpression;
+import org.jetbrains.jet.lang.psi.JetExpression;
+import org.jetbrains.jet.lang.resolve.BindingContext;
+import org.objectweb.asm.Type;
+import org.objectweb.asm.commons.InstructionAdapter;
+
+import java.util.List;
+
+/**
+ * @author alex.tkachman
+ */
+public class NewArray implements IntrinsicMethod {
+    @Override
+    public StackValue generate(ExpressionCodegen codegen, InstructionAdapter v, Type expectedType, PsiElement element, List<JetExpression> arguments, StackValue receiver) {
+        codegen.generateNewArray((JetCallExpression) element, codegen.getBindingContext().get(BindingContext.EXPRESSION_TYPE, (JetExpression) element));
+        return StackValue.onStack(expectedType);
+    }
+}
diff --git a/compiler/frontend/src/jet/Library.jet b/compiler/frontend/src/jet/Library.jet
index 24a7f4e962f..279171d8776 100644
--- a/compiler/frontend/src/jet/Library.jet
+++ b/compiler/frontend/src/jet/Library.jet
@@ -105,7 +105,9 @@ trait Iterable<out T> {
   fun iterator() : Iterator<T>
 }
 
-class Array<T>(val size : Int, init : fun(Int) : T = null ) {
+fun Array<T>(val size : Int) : Array<T?>
+
+class Array<T>(val size : Int, init : fun(Int) : T) {
   fun get(index : Int) : T
   fun set(index : Int, value : T) : Unit
 
diff --git a/compiler/testData/codegen/regressions/kt602.jet b/compiler/testData/codegen/regressions/kt602.jet
new file mode 100644
index 00000000000..aae930a7328
--- /dev/null
+++ b/compiler/testData/codegen/regressions/kt602.jet
@@ -0,0 +1 @@
+fun box() = if(Array<Int>(10) is Array<java.lang.Integer>) "OK" else "fail"
diff --git a/compiler/tests/org/jetbrains/jet/codegen/ArrayGenTest.java b/compiler/tests/org/jetbrains/jet/codegen/ArrayGenTest.java
index 80063a36516..c40d7cffb60 100644
--- a/compiler/tests/org/jetbrains/jet/codegen/ArrayGenTest.java
+++ b/compiler/tests/org/jetbrains/jet/codegen/ArrayGenTest.java
@@ -276,6 +276,10 @@ public class ArrayGenTest extends CodegenTestCase {
         blackBoxFile("regressions/kt503.jet");
     }
 
+    public void testKt602() {
+        blackBoxFile("regressions/kt602.jet");
+    }
+
     public void testKt594() throws Exception {
         loadFile("regressions/kt594.jet");
         System.out.println(generateToText());