One more try

frog$ cat -n T.java
     1 class T {
     2 interface I1 {
     3 public Object clone();
     4 };
     5 interface I2 extends I1 {
     6 };
     7 static class C implements I2 {
     8 public Object clone() { return new C(); }
     9 };
    10 public static void main(String[] args) {
    11 I2 i2 = new C();
    12 i2.clone();
    13 }
    14 }
frog$ newjavac -Xcomplyfields T.java
+ /home/gafter/bin/newjava -Xfuture -Xbootclasspath/p:/net/frog/gafter/gjc-neal/gjclasses2 -classpath /net/frog/gafter/gjc-neal/gjclasses2:/net/frog/gafter/gjc-neal/make/tools/javac/gjc.jar:/net/frog/gafter/gjc-neal/make/tools/javac/gjcmain.jar com.sun.tools.javac.Main -classpath . -Xcomplyfields T.java
+ /net/frog/gafter/gjc-neal/build/solaris-sparc/bin/java -Xfuture -Xfuture -Xbootclasspath/p:/net/frog/gafter/gjc-neal/gjclasses2 -classpath /net/frog/gafter/gjc-neal/gjclasses2:/net/frog/gafter/gjc-neal/make/tools/javac/gjc.jar:/net/frog/gafter/gjc-neal/make/tools/javac/gjcmain.jar com.sun.tools.javac.Main -classpath . -Xcomplyfields T.java
frog$ jdis T.class
super class T
{


Method "<init>":"()V"
        stack 1 locals 1
{
                aload_0;
                invokespecial Method java/lang/Object."<init>":"()V";
                return;
}

public static Method main:"([Ljava/lang/String;)V"
        stack 2 locals 2
{
                new class T$C;
                dup;
                invokespecial Method T$C."<init>":"()V";
                astore_1;
                aload_1;
                invokeinterface InterfaceMethod T$I2.clone:"()Ljava/lang/Object;", 1;
                pop;
                return;
}

static InnerClass C=class T$C of class T;
static abstract interface InnerClass I2=class T$I2 of class T;
static abstract interface InnerClass I1=class T$I1 of class T;

} // end Class T
frog$ newjava T
+ /net/frog/gafter/gjc-neal/build/solaris-sparc/bin/java -Xfuture T
Exception in thread "main" java.lang.AbstractMethodError
        at T.main(T.java:12)
frog$