I just tried it on a project of mine and found it to not work with ex_cldr's compiler task:
could not compile dependency :ex_cldr_dates_times, "mix compile" failed. You can recompile this dependency with "mix deps.compile ex_cldr_dates_times", update it with "mix deps.update ex_cldr_dates_times" or clean it with "mix deps.cleanex_cldr_dates_times"
** (FunctionClauseError) no function clause matching in Mix.Dep.loaded/1
The following arguments were given to Mix.Dep.loaded/1:
# 1
[env: :prod]
Attempted function clauses (showing 1 out of 1):
def loaded([])
(mix) lib/mix/dep.ex:156: Mix.Dep.loaded/1
lib/mix/tasks/compile.cldr.ex:86: Mix.Tasks.Compile.Cldr.compile_cldr_files/0
lib/mix/tasks/compile.cldr.ex:67: Mix.Tasks.Compile.Cldr.run/1
(mix) lib/mix/task.ex:316: Mix.Task.run_task/3
(mix) lib/mix/tasks/compile.all.ex:68: Mix.Tasks.Compile.All.run_compiler/2
(mix) lib/mix/tasks/compile.all.ex:52: Mix.Tasks.Compile.All.do_compile/4
(mix) lib/mix/tasks/compile.all.ex:23: anonymous fn/1 in Mix.Tasks.Compile.All.run/1
(mix) lib/mix/tasks/compile.all.ex:39: Mix.Tasks.Compile.All.with_logger_app/1
Seems like the function is deprecated: @kip
