// file test.scala
object Test {
  var x = 1
  val y = 1
  val f = (n: Int) => n + x + y
}

>javap -private Test$$anonfun$1.class
Compiled from "test.scala"
public final class Test$$anonfun$1 extends scala.runtime.AbstractFunction1$mcII$sp implements scala.Serializable {
  public static final long serialVersionUID;
  public final int apply(int);
  public int apply$mcII$sp(int);
  public final java.lang.Object apply(java.lang.Object);
  public Test$$anonfun$1();
}