From 4592100d357e52ec75900a5c3d4ae9078b1015af Mon Sep 17 00:00:00 2001
From: Jason Axelson <jason.axelson@gmail.com>
Date: Sat, 6 Mar 2021 14:17:17 -1000
Subject: [PATCH] Fix compilation warning on Elixir 1.11
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Here's an example of the warning:
```
==> slack
Compiling 10 files (.ex)
warning: redefining @doc attribute previously set at line 88.

Please remove the duplicate docs. If instead you want to override a previously defined @doc, attach the @doc attribute to a function head:

    @doc """
    new docs
    """
    def lookup_channel_name(...)

  lib/slack/lookups.ex:95: Slack.Lookups.lookup_channel_name/2

Compilation failed due to warnings while using the --warnings-as-errors option
```

On previous versions the initial `@doc` was silently ignored:
```
iex(1)> h Slack.Lookups.lookup_channel_name

                   def lookup_channel_name(channel_id, slack)

Turns a Slack private channel ID ("G…") into a string in the format
"#CHANNEL_NAME".
```
---
 lib/slack/lookups.ex | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/slack/lookups.ex b/lib/slack/lookups.ex
index c568907..301f6c7 100644
--- a/lib/slack/lookups.ex
+++ b/lib/slack/lookups.ex
@@ -86,13 +86,14 @@ defmodule Slack.Lookups do
   @doc ~S"""
   Turns a Slack channel ID (`"C…"`) into a string in the format "#CHANNEL_NAME".
   """
+  def lookup_channel_name(channel_id, slack)
+
+  # Slack channel ID's (`"C…"`)
   def lookup_channel_name(channel_id = "C" <> _id, slack) do
     "#" <> slack.channels[channel_id].name
   end
 
-  @doc ~S"""
-  Turns a Slack private channel ID (`"G…"`) into a string in the format "#CHANNEL_NAME".
-  """
+  # Private channel ID's (`"G…"`)
   def lookup_channel_name(channel_id = "G" <> _id, slack) do
     "#" <> slack.groups[channel_id].name
   end