'undefined local variable or method' when using typeof()

[stugol]

The following code works:

def _Type
    Int32
end
def test(&callback : typeof(_Type)->)
end
test do |a|
end

However, when the code is inside a class, we get an error. See https://play.crystal-lang.org/#/r/qdc

[asterite]

Yes, that should probably work

[ayazhafiz]

Interestingly, this works if _Type is explicitly called from the object:

class TCPBase
  def _Type
    Int32
  end
  
  def test(&callback : typeof(self._Type) -> Nil)
  end
end
TCPBase.new.test { |a| } # compiles

My inclination is that this has to do with the scope of the arguments to typeof, though I can't deduce much from the source code and may be totally wrong.