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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	}
 
	private interface IFoo<T>
	{
 
	}
 
	private class A {}
	private class B {}
 
	private class Foo implements IFoo<A>, IFoo<B>  {
	}
}

Main.java:23: error: repeated interface
	private class Foo implements IFoo<A>, IFoo<B>  {
	                                          ^
Main.java:23: error: IFoo cannot be inherited with different arguments: <Ideone.A> and <Ideone.B>
	private class Foo implements IFoo<A>, IFoo<B>  {
	        ^
2 errors

Standard output is empty