Fix false positives for Style/ArgumentsForwarding

Fixes #12571 (comment).

This PR fixes false positives for `Style/ArgumentsForwarding`
when rest arguments forwarding to a method in block.

changelog/fix_false_positives_for_style_arguments_forwarding.md

@@ -0,0 +1 @@
+* [#12578](https://github.com/rubocop/rubocop/pull/12578): Fix false positives for `Style/ArgumentsForwarding` when rest arguments forwarding to a method in block. ([@koic][])

lib/rubocop/cop/style/arguments_forwarding.rb

@@ -186,12 +186,12 @@ def add_post_ruby_32_offenses(def_node, send_classifications, forwardable_args)
           rest_arg, kwrest_arg, _block_arg = *forwardable_args
 
           send_classifications.each do |send_node, _c, forward_rest, forward_kwrest|
-            if forward_rest
+            if outside_block?(forward_rest)
               register_forward_args_offense(def_node.arguments, rest_arg)
               register_forward_args_offense(send_node, forward_rest)
             end
 
-            if forward_kwrest
+            if outside_block?(forward_kwrest)
               register_forward_kwargs_offense(!forward_rest, def_node.arguments, kwrest_arg)
               register_forward_kwargs_offense(!forward_rest, send_node, forward_kwrest)
             end
@@ -250,6 +250,12 @@ def redundant_named_arg(arg, config_name, keyword)
           redundant_arg_names.include?(arg.source) ? arg : nil
         end
 
+        def outside_block?(node)
+          return false unless node
+
+          node.each_ancestor(:block, :numblock).none?
+        end
+
         def register_forward_args_offense(def_arguments_or_send, rest_arg_or_splat)
           add_offense(rest_arg_or_splat, message: ARGS_MSG) do |corrector|
             add_parens_if_missing(def_arguments_or_send, corrector)

spec/rubocop/cop/style/arguments_forwarding_spec.rb

@@ -1548,21 +1548,53 @@ def foo(*, **)
       RUBY
     end
 
-    it 'registers an offense when forwarding to a method in block' do
-      expect_offense(<<~RUBY)
+    it 'does not register an offense when rest arguments forwarding to a method in block' do
+      expect_no_offenses(<<~RUBY)
         def foo(*args, &block)
-                ^^^^^ Use anonymous positional arguments forwarding (`*`).
           do_something do
             bar(*args, &block)
-                ^^^^^ Use anonymous positional arguments forwarding (`*`).
           end
         end
       RUBY
+    end
 
-      expect_correction(<<~RUBY)
-        def foo(*, &block)
+    it 'does not register an offense when rest arguments forwarding to a method in numbered block' do
+      expect_no_offenses(<<~RUBY)
+        def foo(*args, &block)
+          do_something do
+            bar(*args, &block)
+            baz(_1)
+          end
+        end
+      RUBY
+    end
+
+    it 'does not register an offense when keyword rest arguments forwarding to a method in block' do
+      expect_no_offenses(<<~RUBY)
+        def foo(**kwargs, &block)
+          do_something do
+            bar(**kwargs, &block)
+          end
+        end
+      RUBY
+    end
+
+    it 'does not register an offense when keyword rest arguments forwarding to a method in numbered block' do
+      expect_no_offenses(<<~RUBY)
+        def foo(**kwargs, &block)
           do_something do
-            bar(*, &block)
+            bar(**kwargs, &block)
+            baz(_1)
+          end
+        end
+      RUBY
+    end
+
+    it 'does not register an offense when rest arguments and keyword rest arguments forwarding to a method in block' do
+      expect_no_offenses(<<~RUBY)
+        def foo(*args, **kwargs)
+          block_method do
+            bar(*args, **kwargs)
           end
         end
       RUBY