From 94ac3f782027c4b707470b1aa0f5f66c6702ad9f Mon Sep 17 00:00:00 2001
From: Shugo Maeda <shugo@ruby-lang.org>
Date: Thu, 8 Nov 2018 23:28:40 +0900
Subject: Add a commented code example of what will be produced

---
 .../core_ext/string/output_safety.rb               | 44 +++++++++++-----------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/activesupport/lib/active_support/core_ext/string/output_safety.rb b/activesupport/lib/active_support/core_ext/string/output_safety.rb
index e3f62d7d26..c27d7bbc78 100644
--- a/activesupport/lib/active_support/core_ext/string/output_safety.rb
+++ b/activesupport/lib/active_support/core_ext/string/output_safety.rb
@@ -254,28 +254,28 @@ module ActiveSupport #:nodoc:
     UNSAFE_STRING_METHODS_WITH_BACKREF.each do |unsafe_method|
       if unsafe_method.respond_to?(unsafe_method)
         class_eval <<-EOT, __FILE__, __LINE__ + 1
-          def #{unsafe_method}(*args, &block)
-            if block
-              to_str.#{unsafe_method}(*args) { |*params|
-                set_block_back_references(block, $~)
-                block.call(*params)
-              }
-            else
-              to_str.#{unsafe_method}(*args)
-            end
-          end
-
-          def #{unsafe_method}!(*args, &block)
-            @html_safe = false
-            if block
-              super(*args) { |*params|
-                set_block_back_references(block, $~)
-                block.call(*params)
-              }
-            else
-              super
-            end
-          end
+          def #{unsafe_method}(*args, &block)             # def gsub(*args, &block)
+            if block                                      #   if block
+              to_str.#{unsafe_method}(*args) { |*params|  #     to_str.gsub(*args) { |*params|  
+                set_block_back_references(block, $~)      #       set_block_back_references(block, $~)
+                block.call(*params)                       #       block.call(*params)
+              }                                           #     }
+            else                                          #   else
+              to_str.#{unsafe_method}(*args)              #     to_str.gsub(*args)
+            end                                           #   end
+          end                                             # end
+
+          def #{unsafe_method}!(*args, &block)            # def gsub!(*args, &block)
+            @html_safe = false                            #   @html_safe = false
+            if block                                      #   if block
+              super(*args) { |*params|                    #     super(*args) { |*params|
+                set_block_back_references(block, $~)      #       set_block_back_references(block, $~)
+                block.call(*params)                       #       block.call(*params)
+              }                                           #     }
+            else                                          #   else
+              super                                       #     super
+            end                                           #   end
+          end                                             # end
         EOT
       end
     end
-- 
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