Referring to another member variable

[glassesneo]

class A:
  var a: int
  # referring to member variable `a` with {.initial.}
  var b {.initial.} = self.a

is roughly the same as

class A:
  var a: int
  var b: int
  proc `new`(a) =
    self.a = a
    self.b = self.a