Was gonna say, this is was giving me any type vibes only right in code. Feels like it should be a special form that somehow only works in ExUnit. Or perhaps be called Kernel.return_dynamic_value_but_only_use_this_function_in_tests_ok? 
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I think its closer to unknown than any, which has significantly less ugliness, but ultimately IMO you can’t have a gradually typed language w/ type inference and not give people an option along these lines.
More succinctly, if the function is called Kernel.return_dynamic_value_but_only_use_this_function_in_tests_ok? then people will just use Process.get 
I definitely think care should be taken with the naming, documentation and functionality of the function, but I don’t think its realistic to do anything other than give it a name that represents what it does from a type system perspective, and then discourage people from using it.
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I agree
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Haha yes, I was mostly joking.
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This is working perfectly, thank you 
Was the :warnings_as_errors flag under elixirc_options or test_elixirc_options also deprecated? I now see a warning when using this option with test_elixirc_options:
warning: :warnings_as_errors is deprecated as part of Code.get_compiler_option/1
(elixir 1.18.0-rc.0) lib/code.ex:1597: Code.get_compiler_option/1
(elixir 1.18.0-rc.0) lib/code.ex:1572: anonymous fn/2 in Code.compiler_options/1
(elixir 1.18.0-rc.0) lib/enum.ex:2546: Enum."-reduce/3-lists^foldl/2-0-"/3
(elixir 1.18.0-rc.0) lib/code.ex:1571: Code.compiler_options/1
(mix 1.18.0-rc.0) lib/mix/compilers/test.ex:28: Mix.Compilers.Test.require_and_run/4
(mix 1.18.0-rc.0) lib/mix/tasks/test.ex:617: Mix.Tasks.Test.do_run/3
That should not have warned. I will investigate.
EDIT: Yes, I have double checked and it is deprecated indeed as it is not a compiler option. I have updated the CHANGELOG and improved the deprecation message.
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