###@###.### 2004-05-12

J2SE Version (please include all output from java -version flag):
  java version "1.5.0-beta2"
  Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b50)
  Java HotSpot(TM) Client VM (build 1.5.0-beta2-b50, mixed mode, sharing)

Does this problem occur on J2SE 1.4 or 1.4.1 or 1.4.2? Yes / No (pick one)
  no, works fine with build 48

Operating System Configuration Information (be specific):
  WinXP

Hardware Configuration Information (be specific):
  Dell Optiplex

Bug Description:
  Before build 50, my code compiled, Now it doesn't; get the following
  compiler error (with extra white-space padding):

    [javac] C:\devel\GenericTest.java:11: incompatible types
    [javac] found : java.util.Iterator<GenericTest.Foo<capture of ? extends java.lang.String,capture of ? extends java.awt.Color>>
    [javac] required: java.util.Iterator<GenericTest.Foo< ? extends java.lang.String, ? extends java.awt.Color>>
    [javac] return Collections.singleton(symbol).iterator();


Steps to Reproduce (be specific):

Compile this code:

import java.util.Iterator;
import java.util.Collections;
import java.awt.Color;

public class GenericTest
{
  Foo<? extends String, ? extends Color> symbol;

  public Iterator<Foo<? extends String, ? extends Color>> iterator()
  {
    return Collections.singleton(symbol).iterator();
  }

  public class Foo<A, B> {
  }
}

Casting the result of Collections.singleton doesn't seem to work,
and nore does casting symbol.