Merge pull request #12882 from nekketsuuu/nekketsuuu-case-in-comment

Fix `Layout/CommentIndentation` for comment-only pattern matching

changelog/fix_fix_layout_comment_indentation_for_comment_only.md

@@ -0,0 +1 @@
+* [#12882](https://github.com/rubocop/rubocop/pull/12882): Fix `Layout/CommentIndentation` for comment-only pattern matching. ([@nekketsuuu][])

lib/rubocop/cop/layout/comment_indentation.rb

@@ -160,7 +160,7 @@ def less_indented?(line)
         end
 
         def two_alternatives?(line)
-          /^\s*(else|elsif|when|rescue|ensure)\b/.match?(line)
+          /^\s*(else|elsif|when|in|rescue|ensure)\b/.match?(line)
         end
       end
     end

spec/rubocop/cop/layout/comment_indentation_spec.rb

@@ -113,6 +113,13 @@ def m
               b
             end
             # this is accepted
+            case a
+            # this is accepted
+            in 0
+              #
+              b
+            end
+            # this is accepted
           rescue
           # this is accepted
           ensure
@@ -196,6 +203,19 @@ def m
              #
              ^ Incorrect indentation detected (column 5 instead of 4).
             b
+          when 2
+            # this is also accepted
+          end
+          case a
+          # this is accepted
+          in 0
+            # so is this
+          in 1
+          #
+          ^ Incorrect indentation detected (column 2 instead of 4).
+            b
+          in 2
+            # this is also accepted
           end
       RUBY
 
@@ -225,6 +245,18 @@ def m
           when 1
             #
             b
+          when 2
+            # this is also accepted
+          end
+          case a
+          # this is accepted
+          in 0
+            # so is this
+          in 1
+            #
+            b
+          in 2
+            # this is also accepted
           end
       RUBY
     end