ExUnit.Assertions in a describe block lead to confusing error messages

[adkron]

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Environment

• Elixir & Erlang/OTP versions (elixir --version): Erlang/OTP 20 [erts-9.3] [source] [64-bit] [smp:6:6] [ds:6:6:10] [async-threads:10] [hipe] [kernel-poll:false]

Elixir 1.6.3 (compiled with OTP 19)

• Operating system: OSX 10.13.5

Current behavior

describe "foo" do
  flunk "Anything that is an assertion will cause a compilation error."
end

== Compilation error in file test/model_manager_test.exs ==
** (ExUnit.AssertionError)

Expected behavior

Assertions must be inside of a `test` block.

I don't know if that is the best error, but the current one leads to a lot of headaches. If we could make a better message here we could save developers a lot of time.

[fertapric]

I think this might be a duplicate of https://github.com/elixir-lang/elixir/issues/7683

[adkron]

It does look like a duplicate, Thanks.