I use protocols in my project. When I run mix dialyzer, it returns list of not implemented protocols in Unknown functions: section.

FYI - thanks to @melpon - Dialyxir now supports a way to ignore known warnings.

My dyalizer output is run through sed to remove things I don’t want to see that upstream libraries have borked, definitely ugly. ^.^

@NobbZ, thanks!
Well, I used

def project do
  ...
  consolidate_protocols: false
  ...
end

to switch off consolidation - and still get the same error.

Here is the ticket: https://github.com/elixir-lang/elixir/issues/7708

Do you have your protocol implemented for Atom type?
If not and you don’t want to implement it you can try set @fallback_to_any and in the implementation for Any then return nil.
See this link for details of the protocols and implementation for Any.
If I understand it correctly this tool checks: “what will happen if someone run a protocol method with …”.
If you do not want to implement fallback you need to find a configuration/flag/option to disable missing protocol implementations.
Here you have specified how to use flags, but I don’t know if there is any to disable this warning.

Hmm, I read some about this tool. It’s not a problem with @fallback_to_any.

On stackoverflow this line putted in protocol definition solved the problem

@dialyzer {:nowarn_function, __protocol__: 1}

but it’s not working for me.

Environment:

Erlang/OTP 19 [erts-8.1] [source] [64-bit] [smp:4:4] [async-threads:10]

Elixir 1.3.4

Steps to reproduce:

1. Install latest stable Elixir with it’s dependencies
2. Create new project using: mix new command.
3. Add: {:dialyxir, "~> 0.3.5", only: [:dev]} to your example app dependencies list.
4. Run: mix deps.get and: mix deps.compile
5. Add code from already solved stackoverflow thread.
6. Prepare dialyzer, by executing: mix dialyzer.plt
7. Run dialyzer: mix dialyzer

Expected behaviour:
Dialyzer should not produce any warning messages.

Actual behaviour:
Dialyzer returned many warning (unknown functions) for Elixir protocol implementations: Atom, BitString, Float, Function, List, Map, PID, Port, Reference and Tuple.

What do you think about it @jeremyjh?