newSource1.scala:1: warning: A_1::test()Ljava/lang/String; could not be inlined:
Failed to check if A_1::test()Ljava/lang/String; can be safely inlined to T without causing an IllegalAccessError. Checking instruction INVOKEDYNAMIC m()LA_1$Fun; [
      // handle kind 0x6 : INVOKESTATIC
      not/java/lang/SomeLambdaMetafactory.notAMetaFactoryMethod(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;[Ljava/lang/Object;)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;
    ] failed:
The callee contains an InvokeDynamic instruction with an unknown bootstrap method (not a LambdaMetaFactory).
class T { def foo = A_1.test }
                        ^