Test_2.scala:2: warning: A_1::test()Ljava/lang/String; could not be inlined:
The callee A_1::test()Ljava/lang/String; contains the instruction INVOKEDYNAMIC m()LA_1$Fun; [
      // handle kind 0x6 : INVOKESTATIC
      java/lang/invoke/LambdaMetafactory.metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
      // arguments:
      (Ljava/lang/String;)Ljava/lang/String;,
      // handle kind 0x6 : INVOKESTATIC
      A_1.lambda$test$0(Ljava/lang/String;)Ljava/lang/String;,
      (Ljava/lang/String;)Ljava/lang/String;
    ]
that would cause an IllegalAccessError when inlined into class Test.
  def foo = A_1.test
                ^
error: No warnings can be incurred under -Xfatal-warnings.
one warning found
one error found