Passing an optional proc is not working

[TKD]

Why does passing this optional proc not work or what am I doing wrong?
    
    
    import options
    
    type FooFunc = proc(x: int)
    
    proc foo(x: int) = echo "It works OK!!!"
    proc testFoo(param1: string, f = none(FooFunc)) =
      echo "param1 = ", param1
      if f.isSome:
        (f.get)(3)
    
    testFoo("String works")
    testFoo("Passing optional proc does not work", f = some(foo))
    
    
    
    Run