javac 1.3 fails to report ambiguous class as javac 1.2 did:

=======================
foo/FileSystem.java
=======================
package foo;

public class FileSystem {
}


=======================
Test.java
=======================
import java.io.*;
import foo.*; // This is ambiguous
//import foo.FileSystem;// This is not ambiguous

public class Test {
    public void someMethod(FileSystem f) {
    }
}



javac 1.2 reports the following error when compiling Test:
danmark[929] javac12 foo/FileSystem.java
danmark[930] javac12 Test.java
Test.java:6: Ambiguous class: java.io.FileSystem and foo.FileSystem
    public void someMethod(FileSystem f) {
                ^
1 error
danmark[931]


javac 1.3 doesn't report the error.

If the import statement is changed to 'import foo.FileSystem;', neither compiler reports error.