[NetBeans 200507272036; WinXP; JDK 1.5.0_04]

Issue summary:
--------------
Cast hint may cause attached exception. Sometimes it's necessary to execute the
hint only once, in some cases you need to execute it several times.

Steps to reproduce:
-------------------
1. Add following code a new Java class:
    public String test() {
        Object o;
        return o; |
    }
2. Close the IDE.
3. Launch the IDE.
4. Right after IDE startup go line with | and invoke hint once it appears.
5. Execute the cat hint. 
-> An exception may appear, if it doesn't, undo the changes and try the hint
again until the exception is thrown.

Exception:
----------
java.lang.StackOverflowError
	at org.netbeans.modules.javacore.parser.Scope.computeTypeScope(Scope.java:425)
	at org.netbeans.modules.javacore.parser.Scope.computeTypeScope(Scope.java:425)
	at org.netbeans.modules.javacore.parser.Scope.computeTypeScope(Scope.java:425)
...