The 'else' clause in 'with' does not support guards

[Alexei Sholik]

Trying to compile the following piece of code

with :ok <- {:error, :foo} do 

  :ok 

else 

  {:error, reason} when reason in [:foo, :bar] -> 

    :some_error 

  {:error, _} ->

    :generic_error

end

results in this error

** (CompileError) iex:1: cannot invoke local when/2 inside match, called as: {:error, reason} when :erlang.or(:erlang.=:=(reason, :bar), :erlang.=:=(reason, :foo))

I wonder if there's a specific reason for not supporting everything the 'case' expression supports in the 'else' clause? It looks like an accidental omission to me.

[José Valim]

Accidental omission. Please open up an issue. :)

José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Director of R&D

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[Alexei Sholik]

https://github.com/elixir-lang/elixir/issues/4957

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