From 87bc1190fbc4f8e18682f1bb959a53b263a2df5d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafael=20Mendon=C3=A7a=20Fran=C3=A7a?=
 <rafael@rubyonrails.org>
Date: Thu, 12 Oct 2023 17:32:26 +0000
Subject: [PATCH] Remove deprecated constant
 `AbstractController::Helpers::MissingHelperError`

---
 actionpack/CHANGELOG.md                       |  4 ++++
 actionpack/lib/abstract_controller/helpers.rb | 18 ------------------
 actionpack/test/controller/helper_test.rb     |  6 ------
 guides/source/7_2_release_notes.md            |  2 ++
 4 files changed, 6 insertions(+), 24 deletions(-)

diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index ee70d46a83d7b..172e89cffacfa 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Remove deprecated constant `AbstractController::Helpers::MissingHelperError`.
+
+    *Rafael Mendonça França*
+
 *   Fix a race condition that could cause a `Text file busy - chromedriver`
     error with parallel system tests
 
diff --git a/actionpack/lib/abstract_controller/helpers.rb b/actionpack/lib/abstract_controller/helpers.rb
index 4cf4adf598163..043774c50080a 100644
--- a/actionpack/lib/abstract_controller/helpers.rb
+++ b/actionpack/lib/abstract_controller/helpers.rb
@@ -5,7 +5,6 @@
 
 module AbstractController
   module Helpers
-    include ActiveSupport::Deprecation::DeprecatedConstantAccessor
     extend ActiveSupport::Concern
 
     included do
@@ -24,23 +23,6 @@ module Helpers
       self._helpers = define_helpers_module(self)
     end
 
-    class DeprecatedMissingHelperError < LoadError
-      def initialize(error, path)
-        @error = error
-        @path  = "helpers/#{path}.rb"
-        set_backtrace error.backtrace
-
-        if /^#{path}(\.rb)?$/.match?(error.path)
-          super("Missing helper file helpers/%s.rb" % path)
-        else
-          raise error
-        end
-      end
-    end
-    deprecate_constant "MissingHelperError", "AbstractController::Helpers::DeprecatedMissingHelperError",
-      message: "AbstractController::Helpers::MissingHelperError has been deprecated. If a Helper is not present, a NameError will be raised instead.",
-      deprecator: AbstractController.deprecator
-
     def _helpers
       self.class._helpers
     end
diff --git a/actionpack/test/controller/helper_test.rb b/actionpack/test/controller/helper_test.rb
index 7b904e0c81802..f1bfb8436c25a 100644
--- a/actionpack/test/controller/helper_test.rb
+++ b/actionpack/test/controller/helper_test.rb
@@ -264,12 +264,6 @@ def test_helper_proxy_config
     assert_equal "smth", AllHelpersController.helpers.config.my_var
   end
 
-  def test_missing_helper_error_is_deprecated
-    assert_deprecated(AbstractController.deprecator) do
-      AbstractController::Helpers::MissingHelperError
-    end
-  end
-
   private
     def expected_helper_methods
       TestHelper.instance_methods
diff --git a/guides/source/7_2_release_notes.md b/guides/source/7_2_release_notes.md
index d022b2e416917..ae348b72a45fd 100644
--- a/guides/source/7_2_release_notes.md
+++ b/guides/source/7_2_release_notes.md
@@ -52,6 +52,8 @@ Please refer to the [Changelog][action-pack] for detailed changes.
 
 *   Remove deprecated constant `ActionDispatch::IllegalStateError`.
 
+*   Remove deprecated constant `AbstractController::Helpers::MissingHelperError`.
+
 ### Deprecations
 
 ### Notable changes