[forwarded from http://bugs.debian.org/423160]

seen with trunk 20070720

The gij implementation of EnumMap class contains a flaw: it returns
strange java.lang.Object classes for missing elements. The error can be
demonstrated with this program:

=== Cut ===
import java.util.*;

public class Test {
	enum TestEnum {
		FIRST, SECOND
	}

	public static void main(String[] args) {
		Map<TestEnum, String> map = new EnumMap<TestEnum, String>(TestEnum.class);
		map.put(TestEnum.FIRST, "first");
		System.out.println(map);
		System.out.println(map.containsKey(TestEnum.SECOND));
		System.out.println(map.get(TestEnum.SECOND));
	}
}

$ gcj -C Test.java

tmp $ gij Test
{FIRST=first}
false
Exception in thread "main" java.lang.ClassCastException:
java.lang.Object cannot be cast to java.lang.String
   at Test.main(Test.java:13)

tmp $ java Test
{FIRST=first}
false
null

=== Cut ===

As you can see, Sun Java (the last call) returns correct null, while
GNU libgcj returns bogus java.lang.Object.