test31 = putTree1 {_} {_} {@$\mathbb{N}$@} {@$\mathbb{N}$@} (createEmptyRedBlackTree@$\mathbb{N}$@ @$\mathbb{N}$@ ) 1 1
$ \t @$\rightarrow$@ putTree1 t 2 2
$ \t @$\rightarrow$@ putTree1 t 3 3
$ \t @$\rightarrow$@ putTree1 t 4 4
$ \t @$\rightarrow$@ getRedBlackTree t 4
$ \t x @$\rightarrow$@ x

-- C-c C-n test31 return
  -- Just
  -- (record
  -- { key = 4
  -- ; value = 4
  -- ; right = Nothing
  -- ; left = Nothing
  -- ; color = Red
  -- })