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All you need is a function prototype. I have a detailed explanation at Classes and objects: how many and which file types I actually need to use them?

So, this compiles:

enum WhatArduinoIs {
  Easy, But, Insane, Obsolete, And, Far, Worse, Than, mBed
};

void TellMe(WhatArduinoIs pls);  // prototype
void TellMe(WhatArduinoIs pls) 
  {
  }
void setup() { }
void loop() { }

Off-site reference: How to avoid the quirks of the IDE sketch file pre-preprocessing