case class tst(a: Int) extends AnyVal

public final boolean equals$extension(int $this, Object x$1) {
      int n;
      Object object = x$1;
      boolean bl = object instanceof tst;
      return bl && $this == (n = ((tst)x$1).u())
  }

public final boolean canEqual$extension(int $this, Object x$1) {
      return x$1 instanceof java.lang.Integer;
    }