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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
interface ConsumerOne<T> {
    void accept(T a);
}
 
interface CustomIterable<T> extends Iterable<T> {
    void forEach(ConsumerOne<? super T> c); //overload
}
class Ideone
{
	private static CustomIterable<Ideone> iterable;
    private static List<Ideone> aList;
	public static void main (String[] args)
	{
		iterable.forEach((Ideone a) -> aList.add(a));
	}
}

Main.java:20: error: reference to forEach is ambiguous
		iterable.forEach((Ideone a) -> aList.add(a));
		        ^
  both method forEach(Consumer<? super T#1>) in Iterable and method forEach(ConsumerOne<? super T#2>) in CustomIterable match
  where T#1,T#2 are type-variables:
    T#1 extends Object declared in interface Iterable
    T#2 extends Object declared in interface CustomIterable
1 error

Standard output is empty