Set: pp::colors
  Set: pp::unicode
  Imported 'num'
  Imported 'tactic'
  Using: num
  Assumed: a
num::one + num::succ num::one
====>
num::succ (num::succ (num::succ num::zero))
num::one + num::succ num::one = num::succ (num::succ (num::succ num::zero))

num::succ (num::succ num::one) * num::succ num::one
====>
num::succ (num::succ (num::succ (num::succ (num::succ (num::succ num::zero)))))
num::succ (num::succ num::one) * num::succ num::one =
num::succ (num::succ (num::succ (num::succ (num::succ (num::succ num::zero)))))

  Proved: T1
  Proved: T2
  Proved: T3
  Set: simplifier::unfold
  Defined: two
  Defined: three
  Defined: four
  Set: lean::pp::implicit
  Proved: test