### Eclipse Workspace Patch 1.0
#P org.eclipse.wst.jsdt.core
Index: src/org/eclipse/wst/jsdt/core/infer/InferEngine.java
===================================================================
RCS file: /cvsroot/webtools/sourceediting/plugins/org.eclipse.wst.jsdt.core/src/org/eclipse/wst/jsdt/core/infer/InferEngine.java,v
retrieving revision 1.29
diff -u -r1.29 InferEngine.java
--- src/org/eclipse/wst/jsdt/core/infer/InferEngine.java	7 Jan 2009 20:16:59 -0000	1.29
+++ src/org/eclipse/wst/jsdt/core/infer/InferEngine.java	31 Mar 2009 20:43:59 -0000
@@ -49,6 +49,7 @@
 import org.eclipse.wst.jsdt.internal.compiler.ast.StringLiteral;
 import org.eclipse.wst.jsdt.internal.compiler.ast.ThisReference;
 import org.eclipse.wst.jsdt.internal.compiler.ast.TrueLiteral;
+import org.eclipse.wst.jsdt.internal.compiler.ast.UnaryExpression;
 import org.eclipse.wst.jsdt.internal.compiler.util.HashtableOfObject;
 import org.eclipse.wst.jsdt.internal.compiler.util.Util;
 
@@ -959,6 +960,9 @@
 			return getTypeOf(((Assignment)expression).getExpression());
 		else if (expression instanceof FunctionExpression)
 			return FunctionType;
+		else if(expression instanceof UnaryExpression) {
+			return getTypeOf(((UnaryExpression)expression).expression);
+		}
 
 		return null;
 	}