Nullability requirement violation fixed

idea/src/org/jetbrains/jet/lang/psi/JetParenthesizedExpression.java

@@ -2,6 +2,7 @@ package org.jetbrains.jet.lang.psi;
 
 import com.intellij.lang.ASTNode;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * @author max
@@ -16,6 +17,7 @@ public class JetParenthesizedExpression extends JetExpression {
         visitor.visitParenthesizedExpression(this);
     }
 
+    @Nullable @IfNotParsed
     public JetExpression getExpression() {
         return findChildByClass(JetExpression.class);
     }

idea/src/org/jetbrains/jet/lang/types/JetTypeInferrer.java

@@ -398,7 +398,10 @@ public class JetTypeInferrer {
 
         @Override
         public void visitParenthesizedExpression(JetParenthesizedExpression expression) {
-            result = getType(scope, expression.getExpression(), false);
+            JetExpression inner = expression.getExpression();
+            if (inner != null) {
+                result = getType(scope, inner, false);
+            }
         }
 
         @Override