Bug 551805 - [expressions] Fix toString() of NotExpression

Change-Id: I5f8e6d2b3d7e9b5202bb7a3b5a55ddb56de8c107
diff --git a/bundles/org.eclipse.core.expressions/src/org/eclipse/core/internal/expressions/NotExpression.java b/bundles/org.eclipse.core.expressions/src/org/eclipse/core/internal/expressions/NotExpression.java
index 4395762..100df71 100644
--- a/bundles/org.eclipse.core.expressions/src/org/eclipse/core/internal/expressions/NotExpression.java
+++ b/bundles/org.eclipse.core.expressions/src/org/eclipse/core/internal/expressions/NotExpression.java
@@ -60,6 +60,10 @@
 
 	@Override
 	public String toString() {
-		return getClass().getSimpleName();
+		StringBuilder builder = new StringBuilder(getClass().getSimpleName());
+		builder.append(" [expression="); //$NON-NLS-1$
+		builder.append(fExpression);
+		builder.append("]"); //$NON-NLS-1$
+		return builder.toString();
 	}
 }