anchor.diff: +%% @doc Utility functions.
   -module(clj_utils).
   
   -include("clojerl.hrl").
  
positive.code:     X >  Y -> 1
    end.
  
  -spec env_vars() -> #{binary() => binary()}.
  env_vars() ->
    Pairs = [ begin
  
negative.code: error_msg_to_binary(Message) ->
    clj_rt:str(Message).
  
  %% @doc Groups the items in the list using the values returned by the
  %% `GroupBy' function.
  -spec group_by(fun((any()) -> any()), list()) -> map().
  group_by(GroupBy, List) ->
    Group = fun(Item, Acc) ->
  