[Fix rubocop#448] Fix a false positive for `Performance/RedundantBloc…

…kCall`

Fixes rubocop#448.

This PR fixes a false positive for `Performance/RedundantBlockCall`
when using `block.call` with block argument.

changelog/fix_false_positive_for_performance_redundant_block_call.md

@@ -0,0 +1 @@
+* [#448](https://github.com/rubocop/rubocop-performance/issues/448): Fix a false positive for `Performance/RedundantBlockCall` when using `block.call` with block argument. ([@koic][])

lib/rubocop/cop/performance/redundant_block_call.rb

@@ -49,6 +49,8 @@ def on_def(node)
             next unless body
 
             calls_to_report(argname, body).each do |blockcall|
+              next if blockcall.block_literal?
+
               add_offense(blockcall, message: format(MSG, argname: argname)) do |corrector|
                 autocorrect(corrector, blockcall)
               end

spec/rubocop/cop/performance/redundant_block_call_spec.rb

@@ -117,6 +117,22 @@ def method(&block)
     RUBY
   end
 
+  it 'accepts when using `block.call` with block argument' do
+    expect_no_offenses(<<~RUBY)
+      def method(&block)
+        block.call { do_something }
+      end
+    RUBY
+  end
+
+  it 'accepts when using `block.call` with numbered block argument' do
+    expect_no_offenses(<<~RUBY)
+      def method(&block)
+        block.call { _1.do_something }
+      end
+    RUBY
+  end
+
   it 'accepts another block being passed along with other args' do
     expect_no_offenses(<<~RUBY)
       def method(&block)