[Fix rubocop#214] Fix a false positive for `Performance/RedundantEqua…

…lityComparisonBlock`

Fixes rubocop#214.

This PR fixes a false positive for `Performance/RedundantEqualityComparisonBlock`
when using multiple block arguments.

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## master (unreleased)
 
+### Bug fixes
+
+* [#207](https://github.com/rubocop/rubocop-performance/issues/207): Fix a false positive for `Performance/RedundantEqualityComparisonBlock` when using multiple block arguments. ([@koic][])
+
 ## 1.10.0 (2021-03-01)
 
 ### New features

lib/rubocop/cop/performance/redundant_equality_comparison_block.rb

@@ -34,7 +34,7 @@ class RedundantEqualityComparisonBlock < Base
         COMPARISON_METHODS = %i[== === is_a? kind_of?].freeze
 
         def on_block(node)
-          return unless TARGET_METHODS.include?(node.method_name)
+          return unless TARGET_METHODS.include?(node.method_name) && node.arguments.one?
 
           block_argument = node.arguments.first
           block_body = node.body

spec/rubocop/cop/performance/redundant_equality_comparison_block_spec.rb

@@ -65,6 +65,12 @@
       RUBY
     end
 
+    it 'does not register and corrects an offense when using multiple block arguments' do
+      expect_no_offenses(<<~RUBY)
+        items.all? { |key, _value| key == other }
+      RUBY
+    end
+
     it 'does not register and corrects an offense when using block argument is not used as it is' do
       expect_no_offenses(<<~RUBY)
         items.all? { |item| item.do_something == other }