import static java.util.stream.Collectors.toMap; 

import java.util.Collection; 
import java.util.function.Function; 

abstract class CollectionConsumer<T extends AbstractClass> { 

  protected CollectionConsumer(Collection<T> col) { 
    col.stream().collect(toMap(T::getId, Function.identity())); // crashes javac (1.8.0_51-b16), compiles fine with eclipse compiler 
                                                                // and javac (1.9.0-ea-b72) 
    col.stream().collect(toMap(AbstractClass::getId, Function.identity())); // compiles fine with both javac (all versions) and 
                                                                            // eclipse compiler 
  } 

}