diff --git a/idea/src/org/jetbrains/jet/lang/psi/JetUnaryExpression.java b/idea/src/org/jetbrains/jet/lang/psi/JetUnaryExpression.java
index 6e66ee62660..ca81e0d0735 100644
--- a/idea/src/org/jetbrains/jet/lang/psi/JetUnaryExpression.java
+++ b/idea/src/org/jetbrains/jet/lang/psi/JetUnaryExpression.java
@@ -13,6 +13,7 @@ public abstract class JetUnaryExpression extends JetExpression {
         super(node);
     }
 
+    @Nullable @IfNotParsed
     public abstract JetExpression getBaseExpression();
 
     @NotNull
diff --git a/idea/src/org/jetbrains/jet/lang/resolve/WritableScopeImpl.java b/idea/src/org/jetbrains/jet/lang/resolve/WritableScopeImpl.java
index 7c813ebe042..637e6d84d19 100644
--- a/idea/src/org/jetbrains/jet/lang/resolve/WritableScopeImpl.java
+++ b/idea/src/org/jetbrains/jet/lang/resolve/WritableScopeImpl.java
@@ -17,6 +17,7 @@ import java.util.*;
 public class WritableScopeImpl extends WritableScopeWithImports {
 
     private final Collection<DeclarationDescriptor> allDescriptors = Sets.newHashSet();
+    private boolean allDescriptorsDone = false;
 
     @NotNull
     private final DeclarationDescriptor ownerDeclarationDescriptor;
@@ -38,7 +39,6 @@ public class WritableScopeImpl extends WritableScopeWithImports {
     public WritableScopeImpl(@NotNull JetScope scope, @NotNull DeclarationDescriptor owner, @NotNull ErrorHandler errorHandler) {
         super(scope, errorHandler);
         this.ownerDeclarationDescriptor = owner;
-        this.allDescriptors.addAll(scope.getAllDescriptors());
     }
 
     @NotNull
@@ -57,7 +57,6 @@ public class WritableScopeImpl extends WritableScopeWithImports {
 
     @Override
     public void importScope(@NotNull JetScope imported) {
-        allDescriptors.addAll(imported.getAllDescriptors());
         super.importScope(imported);
     }
 
@@ -69,6 +68,13 @@ public class WritableScopeImpl extends WritableScopeWithImports {
 
     @Override
     public Collection<DeclarationDescriptor> getAllDescriptors() {
+        if (!allDescriptorsDone) {
+            allDescriptorsDone = true;
+            allDescriptors.addAll(getWorkerScope().getAllDescriptors());
+            for (JetScope imported : getImports()) {
+                allDescriptors.addAll(imported.getAllDescriptors());
+            }
+        }
         return allDescriptors;
     }
 
diff --git a/idea/src/org/jetbrains/jet/lang/types/JetTypeInferrer.java b/idea/src/org/jetbrains/jet/lang/types/JetTypeInferrer.java
index f6ed720f46c..9f13ebb016c 100644
--- a/idea/src/org/jetbrains/jet/lang/types/JetTypeInferrer.java
+++ b/idea/src/org/jetbrains/jet/lang/types/JetTypeInferrer.java
@@ -1885,10 +1885,14 @@ public class JetTypeInferrer {
 
         @Override
         public void visitUnaryExpression(JetUnaryExpression expression) {
+            JetExpression baseExpression = expression.getBaseExpression();
+            if (baseExpression == null) {
+                return;
+            }
             JetSimpleNameExpression operationSign = expression.getOperationSign();
             if (JetTokens.LABELS.contains(operationSign.getReferencedNameElementType())) {
                 // TODO : Some processing for the label?
-                result = getType(expression.getBaseExpression());
+                result = getType(baseExpression);
                 return;
             }
             IElementType operationType = operationSign.getReferencedNameElementType();
@@ -1897,7 +1901,7 @@ public class JetTypeInferrer {
                 trace.getErrorHandler().genericError(operationSign.getNode(), "Unknown unary operation");
             }
             else {
-                JetType receiverType = getType(scope, expression.getBaseExpression(), false);
+                JetType receiverType = getType(scope, baseExpression, false);
                 if (receiverType != null) {
                     FunctionDescriptor functionDescriptor = lookupFunction(scope, expression.getOperationSign(), name, receiverType, Collections.<JetType>emptyList(), true);
                     if (functionDescriptor != null) {