code: @Override
    public MethodVisitor visitMethod(int access,
                                     String name,
                                     String description,
                                     String signature,
                                     String[] exceptions) {
      assert (currentClass != null);
      if (signature == null)
        signature = name + description;
      return currentClass.visitMethod(access, name, description,
          signature, exceptions);
    }
docs: "Visit" a method.
  
  @param access      field access modifiers, etc.
  @param name        field name
  @param description field description
  @param signature   field signature
  @param exceptions  list of exception names the method throws
  @return null.