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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
class WildcardError {
 
    void foo(List<?> i) {
        i.set(0, i.get(0));
    }
}
 
class Ideone {
	public static void main (String[] args) throws java.lang.Exception {
		// your code goes here
 
	}
}

Main.java:10: error: incompatible types: Object cannot be converted to CAP#1
        i.set(0, i.get(0));
                      ^
  where CAP#1 is a fresh type-variable:
    CAP#1 extends Object from capture of ?
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error

Standard output is empty