Commits on Apr 23, 2019

1. [Fix rubocop#6956] Prevent auto-correct confliction of Lint/Lambda … …

   …and `Lint/UnusedBlockArgument`
   
   Fixes rubocop#6956.
   
   This PR prevents auto-correct confliction of `Lint/Lambda` and `Lint/UnusedBlockArgument`.
   
   The following is the reproduction procedure.
   
   ```ruby
   # example.rb
   c = -> event do
     puts 'Hello world'
   end
   ```
   
   ```console
   % rubocop example.rb -a --only Style/Lambda,Lint/UnusedBlockArgument
   ```
   
   ## Before
   
   A reserved word `lambda` is broken.
   
   ```diff
   % git diff
   diff --git a/example.rb b/example.rb
   index 3445c6f..b8e24f4 100644
   --- a/example.rb
   +++ b/example.rb
   @@ -1,3 +1,3 @@
   -c = -> event do
   +c = lambda_ do |_event|
      puts 'Hello world'
    end
   ```
   
   ## After
   
   It will be a valid code.
   
   ```diff
   % git diff
   diff --git a/example.rb b/example.rb
   index 3445c6f..9c22b37 100644
   --- a/example.rb
   +++ b/example.rb
   @@ -1,3 +1,3 @@
   -c = -> event do
   +c = lambda do |_event|
      puts 'Hello world'
    end
   ```

   

   koic committed Apr 23, 2019
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