it is expected behavior, java uses invokeDynamic a...

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[lex]

it is expected behavior, java uses invokeDynamic and a method reference is one sort of call site, kotlin uses interfaces and implementations, closures are anonymous classes, method reference is KFunction1 that is implementation on Function1. In this case KFunction1 is not implement Consumer class, but if consumer will function (args)-> Unit then method reference will work, because java type will Function1