fork(1) download

copy

/* 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
{
	interface MyInterface<T> {
 
    <T> T test(T t);    
}
 
	static <T> T foo(T t) { return t; }
 
	public static void main (String[] args) throws java.lang.Exception
	{
		MyInterface<?> x = Ideone::foo;
		MyInterface<?> y = a -> a;
	}
}

Main.java:20: error: incompatible types: invalid functional descriptor for lambda expression
		MyInterface<?> y = a -> a;
		                   ^
    method <T>(T)T in interface MyInterface is generic
  where T is a type-variable:
    T extends Object declared in method <T>test(T)
1 error

Standard output is empty