Non-exported type from EDoc chunk shows in documentation if used in internal function spec

[g-andrade]

Following what I thought was a bug in rebar3_ex_doc but managed to reproduce using only EDoc + ExDoc.

• ExDoc version: 0.39.1
• Elixir version: 1.18.4
• OTP version: 27.3.4.5
• rebar3 version: 3.25.1

Example

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^ The only difference between these two modules is that the first declares a -moduledoc attribute instead of a @doc tag. From my investigation, this appears to make ExDoc no longer depend on the separate EDoc chunk - even when I deleted it, the module showed in the docs.

Looking at documentation data differences

Running Code.fetch_docs/1 for both modules returns very different data.

I can't tell if the root cause is that the EDoc chunk file has more data than it should, or if it's in how ExDoc filters that data.

Demo app

mix_test.zip contains a Mix library that reproduces the issue with the following commands (or make doc):

mix compile
rebar3 as dev edoc # produces the chunk required for the bad module to show in the docs
ex_doc "mix_test" "0.0.0" _build/dev/lib/mix_test/ebin

[josevalim]

ExDoc just outputs what is in the chunk. If the data is in the chunk, then we are going to show it, unless it is explicitly marked as hidden. So the question is why it appears in the chunk in the first place!