I just ran across a small but pretty obvious bug in javac's error
reporting. I can understand if this is hard to fix, but is this a known problem?

/cygdrive/c/Users/kbr/tmp>javac JavacTest.java
JavacTest.java:7: cannot resolve symbol
symbol : class Applet
location: class JavacTest
   public void test(Applet foo) {
                    ^
JavacTest.java:7: test(java.awt.Window) is already defined in JavacTest
   public void test(Applet foo) {
               ^
2 errors

The first error is warranted but the second one is nonsense.
import java.awt.*;

public class JavacTest {
  public void test(Window foo) {
  }

  public void test(Applet foo) {
  }
}