diff options
| -rw-r--r-- | .rubocop.yml | 3 | ||||
| -rw-r--r-- | Gemfile.lock | 4 | ||||
| -rw-r--r-- | activemodel/lib/active_model/attribute_mutation_tracker.rb | 117 | ||||
| -rw-r--r-- | activemodel/lib/active_model/dirty.rb | 119 | ||||
| -rw-r--r-- | activerecord/lib/active_record/attribute_methods/dirty.rb | 14 | ||||
| -rw-r--r-- | activerecord/lib/active_record/migration.rb | 34 | ||||
| -rw-r--r-- | activesupport/activesupport.gemspec | 2 | ||||
| -rw-r--r-- | activesupport/lib/active_support/dependencies/zeitwerk_integration.rb | 6 | ||||
| -rw-r--r-- | guides/source/engines.md | 6 | ||||
| -rw-r--r-- | railties/test/application/zeitwerk_integration_test.rb | 9 | ||||
| -rw-r--r-- | railties/test/generators/actions_test.rb | 2 |
11 files changed, 164 insertions, 152 deletions
diff --git a/.rubocop.yml b/.rubocop.yml index b1c68bd06e..3dbd4a27a6 100644 --- a/.rubocop.yml +++ b/.rubocop.yml @@ -116,6 +116,9 @@ Layout/SpaceAroundOperators: Layout/SpaceBeforeComma: Enabled: true +Layout/SpaceBeforeComment: + Enabled: true + Layout/SpaceBeforeFirstArg: Enabled: true diff --git a/Gemfile.lock b/Gemfile.lock index 8e219f3f31..b92603d799 100644 --- a/Gemfile.lock +++ b/Gemfile.lock @@ -71,7 +71,7 @@ PATH i18n (>= 0.7, < 2) minitest (~> 5.1) tzinfo (~> 1.1) - zeitwerk (~> 2.1) + zeitwerk (~> 2.1, >= 2.1.2) rails (6.0.0.beta3) actioncable (= 6.0.0.beta3) actionmailbox (= 6.0.0.beta3) @@ -526,7 +526,7 @@ GEM websocket-extensions (0.1.3) xpath (3.2.0) nokogiri (~> 1.8) - zeitwerk (2.1.0) + zeitwerk (2.1.2) PLATFORMS java diff --git a/activemodel/lib/active_model/attribute_mutation_tracker.rb b/activemodel/lib/active_model/attribute_mutation_tracker.rb index 6abf37bd44..d8cd48a53b 100644 --- a/activemodel/lib/active_model/attribute_mutation_tracker.rb +++ b/activemodel/lib/active_model/attribute_mutation_tracker.rb @@ -1,14 +1,15 @@ # frozen_string_literal: true require "active_support/core_ext/hash/indifferent_access" +require "active_support/core_ext/object/duplicable" module ActiveModel class AttributeMutationTracker # :nodoc: OPTION_NOT_GIVEN = Object.new - def initialize(attributes) + def initialize(attributes, forced_changes = Set.new) @attributes = attributes - @forced_changes = Set.new + @forced_changes = forced_changes end def changed_attribute_names @@ -18,24 +19,22 @@ module ActiveModel def changed_values attr_names.each_with_object({}.with_indifferent_access) do |attr_name, result| if changed?(attr_name) - result[attr_name] = attributes[attr_name].original_value + result[attr_name] = original_value(attr_name) end end end def changes attr_names.each_with_object({}.with_indifferent_access) do |attr_name, result| - change = change_to_attribute(attr_name) - if change + if change = change_to_attribute(attr_name) result.merge!(attr_name => change) end end end def change_to_attribute(attr_name) - attr_name = attr_name.to_s if changed?(attr_name) - [attributes[attr_name].original_value, attributes.fetch_value(attr_name)] + [original_value(attr_name), fetch_value(attr_name)] end end @@ -44,29 +43,26 @@ module ActiveModel end def changed?(attr_name, from: OPTION_NOT_GIVEN, to: OPTION_NOT_GIVEN) - attr_name = attr_name.to_s - forced_changes.include?(attr_name) || - attributes[attr_name].changed? && - (OPTION_NOT_GIVEN == from || attributes[attr_name].original_value == from) && - (OPTION_NOT_GIVEN == to || attributes[attr_name].value == to) + attribute_changed?(attr_name) && + (OPTION_NOT_GIVEN == from || original_value(attr_name) == from) && + (OPTION_NOT_GIVEN == to || fetch_value(attr_name) == to) end def changed_in_place?(attr_name) - attributes[attr_name.to_s].changed_in_place? + attributes[attr_name].changed_in_place? end def forget_change(attr_name) - attr_name = attr_name.to_s attributes[attr_name] = attributes[attr_name].forgetting_assignment forced_changes.delete(attr_name) end def original_value(attr_name) - attributes[attr_name.to_s].original_value + attributes[attr_name].original_value end def force_change(attr_name) - forced_changes << attr_name.to_s + forced_changes << attr_name end private @@ -75,45 +71,108 @@ module ActiveModel def attr_names attributes.keys end + + def attribute_changed?(attr_name) + forced_changes.include?(attr_name) || !!attributes[attr_name].changed? + end + + def fetch_value(attr_name) + attributes.fetch_value(attr_name) + end + end + + class ForcedMutationTracker < AttributeMutationTracker # :nodoc: + def initialize(attributes, forced_changes = {}) + super + @finalized_changes = nil + end + + def changed_in_place?(attr_name) + false + end + + def change_to_attribute(attr_name) + if finalized_changes&.include?(attr_name) + finalized_changes[attr_name].dup + else + super + end + end + + def forget_change(attr_name) + forced_changes.delete(attr_name) + end + + def original_value(attr_name) + if changed?(attr_name) + forced_changes[attr_name] + else + fetch_value(attr_name) + end + end + + def force_change(attr_name) + forced_changes[attr_name] = clone_value(attr_name) unless attribute_changed?(attr_name) + end + + def finalize_changes + @finalized_changes = changes + end + + private + attr_reader :finalized_changes + + def attr_names + forced_changes.keys + end + + def attribute_changed?(attr_name) + forced_changes.include?(attr_name) + end + + def fetch_value(attr_name) + attributes.send(:_read_attribute, attr_name) + end + + def clone_value(attr_name) + value = fetch_value(attr_name) + value.duplicable? ? value.clone : value + rescue TypeError, NoMethodError + value + end end class NullMutationTracker # :nodoc: include Singleton - def changed_attribute_names(*) + def changed_attribute_names [] end - def changed_values(*) + def changed_values {} end - def changes(*) + def changes {} end def change_to_attribute(attr_name) end - def any_changes?(*) + def any_changes? false end - def changed?(*) + def changed?(attr_name, **) false end - def changed_in_place?(*) + def changed_in_place?(attr_name) false end - def forget_change(*) - end - - def original_value(*) - end - - def force_change(*) + def original_value(attr_name) end end end diff --git a/activemodel/lib/active_model/dirty.rb b/activemodel/lib/active_model/dirty.rb index 0d9e761b1e..ab2c9d04ae 100644 --- a/activemodel/lib/active_model/dirty.rb +++ b/activemodel/lib/active_model/dirty.rb @@ -1,7 +1,5 @@ # frozen_string_literal: true -require "active_support/hash_with_indifferent_access" -require "active_support/core_ext/object/duplicable" require "active_model/attribute_mutation_tracker" module ActiveModel @@ -122,9 +120,6 @@ module ActiveModel extend ActiveSupport::Concern include ActiveModel::AttributeMethods - OPTION_NOT_GIVEN = Object.new # :nodoc: - private_constant :OPTION_NOT_GIVEN - included do attribute_method_suffix "_changed?", "_change", "_will_change!", "_was" attribute_method_suffix "_previously_changed?", "_previous_change" @@ -145,10 +140,9 @@ module ActiveModel # +mutations_from_database+ to +mutations_before_last_save+ respectively. def changes_applied unless defined?(@attributes) - @previously_changed = changes + mutations_from_database.finalize_changes end @mutations_before_last_save = mutations_from_database - @attributes_changed_by_setter = ActiveSupport::HashWithIndifferentAccess.new forget_attribute_assignments @mutations_from_database = nil end @@ -159,7 +153,7 @@ module ActiveModel # person.name = 'bob' # person.changed? # => true def changed? - changed_attributes.present? + mutations_from_database.any_changes? end # Returns an array with the name of the attributes with unsaved changes. @@ -168,42 +162,37 @@ module ActiveModel # person.name = 'bob' # person.changed # => ["name"] def changed - changed_attributes.keys + mutations_from_database.changed_attribute_names end # Handles <tt>*_changed?</tt> for +method_missing+. - def attribute_changed?(attr, from: OPTION_NOT_GIVEN, to: OPTION_NOT_GIVEN) # :nodoc: - !!changes_include?(attr) && - (to == OPTION_NOT_GIVEN || to == _read_attribute(attr)) && - (from == OPTION_NOT_GIVEN || from == changed_attributes[attr]) + def attribute_changed?(attr_name, **options) # :nodoc: + mutations_from_database.changed?(attr_name.to_s, options) end # Handles <tt>*_was</tt> for +method_missing+. - def attribute_was(attr) # :nodoc: - attribute_changed?(attr) ? changed_attributes[attr] : _read_attribute(attr) + def attribute_was(attr_name) # :nodoc: + mutations_from_database.original_value(attr_name.to_s) end # Handles <tt>*_previously_changed?</tt> for +method_missing+. - def attribute_previously_changed?(attr) #:nodoc: - previous_changes_include?(attr) + def attribute_previously_changed?(attr_name) # :nodoc: + mutations_before_last_save.changed?(attr_name.to_s) end # Restore all previous data of the provided attributes. - def restore_attributes(attributes = changed) - attributes.each { |attr| restore_attribute! attr } + def restore_attributes(attr_names = changed) + attr_names.each { |attr_name| restore_attribute!(attr_name) } end # Clears all dirty data: current changes and previous changes. def clear_changes_information - @previously_changed = ActiveSupport::HashWithIndifferentAccess.new @mutations_before_last_save = nil - @attributes_changed_by_setter = ActiveSupport::HashWithIndifferentAccess.new forget_attribute_assignments @mutations_from_database = nil end def clear_attribute_changes(attr_names) - attributes_changed_by_setter.except!(*attr_names) attr_names.each do |attr_name| clear_attribute_change(attr_name) end @@ -216,13 +205,7 @@ module ActiveModel # person.name = 'robert' # person.changed_attributes # => {"name" => "bob"} def changed_attributes - # This should only be set by methods which will call changed_attributes - # multiple times when it is known that the computed value cannot change. - if defined?(@cached_changed_attributes) - @cached_changed_attributes - else - attributes_changed_by_setter.reverse_merge(mutations_from_database.changed_values).freeze - end + mutations_from_database.changed_values end # Returns a hash of changed attributes indicating their original @@ -232,9 +215,7 @@ module ActiveModel # person.name = 'bob' # person.changes # => { "name" => ["bill", "bob"] } def changes - cache_changed_attributes do - ActiveSupport::HashWithIndifferentAccess[changed.map { |attr| [attr, attribute_change(attr)] }] - end + mutations_from_database.changes end # Returns a hash of attributes that were changed before the model was saved. @@ -244,27 +225,23 @@ module ActiveModel # person.save # person.previous_changes # => {"name" => ["bob", "robert"]} def previous_changes - @previously_changed ||= ActiveSupport::HashWithIndifferentAccess.new - @previously_changed.merge(mutations_before_last_save.changes) + mutations_before_last_save.changes end def attribute_changed_in_place?(attr_name) # :nodoc: - mutations_from_database.changed_in_place?(attr_name) + mutations_from_database.changed_in_place?(attr_name.to_s) end private def clear_attribute_change(attr_name) - mutations_from_database.forget_change(attr_name) + mutations_from_database.forget_change(attr_name.to_s) end def mutations_from_database - unless defined?(@mutations_from_database) - @mutations_from_database = nil - end @mutations_from_database ||= if defined?(@attributes) ActiveModel::AttributeMutationTracker.new(@attributes) else - NullMutationTracker.instance + ActiveModel::ForcedMutationTracker.new(self) end end @@ -276,68 +253,28 @@ module ActiveModel @mutations_before_last_save ||= ActiveModel::NullMutationTracker.instance end - def cache_changed_attributes - @cached_changed_attributes = changed_attributes - yield - ensure - clear_changed_attributes_cache - end - - def clear_changed_attributes_cache - remove_instance_variable(:@cached_changed_attributes) if defined?(@cached_changed_attributes) - end - - # Returns +true+ if attr_name is changed, +false+ otherwise. - def changes_include?(attr_name) - attributes_changed_by_setter.include?(attr_name) || mutations_from_database.changed?(attr_name) - end - alias attribute_changed_by_setter? changes_include? - - # Returns +true+ if attr_name were changed before the model was saved, - # +false+ otherwise. - def previous_changes_include?(attr_name) - previous_changes.include?(attr_name) - end - # Handles <tt>*_change</tt> for +method_missing+. - def attribute_change(attr) - [changed_attributes[attr], _read_attribute(attr)] if attribute_changed?(attr) + def attribute_change(attr_name) + mutations_from_database.change_to_attribute(attr_name.to_s) end # Handles <tt>*_previous_change</tt> for +method_missing+. - def attribute_previous_change(attr) - previous_changes[attr] + def attribute_previous_change(attr_name) + mutations_before_last_save.change_to_attribute(attr_name.to_s) end # Handles <tt>*_will_change!</tt> for +method_missing+. - def attribute_will_change!(attr) - unless attribute_changed?(attr) - begin - value = _read_attribute(attr) - value = value.duplicable? ? value.clone : value - rescue TypeError, NoMethodError - end - - set_attribute_was(attr, value) - end - mutations_from_database.force_change(attr) + def attribute_will_change!(attr_name) + mutations_from_database.force_change(attr_name.to_s) end # Handles <tt>restore_*!</tt> for +method_missing+. - def restore_attribute!(attr) - if attribute_changed?(attr) - __send__("#{attr}=", changed_attributes[attr]) - clear_attribute_changes([attr]) + def restore_attribute!(attr_name) + attr_name = attr_name.to_s + if attribute_changed?(attr_name) + __send__("#{attr_name}=", attribute_was(attr_name)) + clear_attribute_change(attr_name) end end - - def attributes_changed_by_setter - @attributes_changed_by_setter ||= ActiveSupport::HashWithIndifferentAccess.new - end - - # Force an attribute to have a particular "before" value - def set_attribute_was(attr, old_value) - attributes_changed_by_setter[attr] = old_value - end end end diff --git a/activerecord/lib/active_record/attribute_methods/dirty.rb b/activerecord/lib/active_record/attribute_methods/dirty.rb index 45e4b8adfa..920a7b2038 100644 --- a/activerecord/lib/active_record/attribute_methods/dirty.rb +++ b/activerecord/lib/active_record/attribute_methods/dirty.rb @@ -29,9 +29,7 @@ module ActiveRecord # <tt>reload</tt> the record and clears changed attributes. def reload(*) super.tap do - @previously_changed = ActiveSupport::HashWithIndifferentAccess.new @mutations_before_last_save = nil - @attributes_changed_by_setter = ActiveSupport::HashWithIndifferentAccess.new @mutations_from_database = nil end end @@ -51,7 +49,7 @@ module ActiveRecord # +to+ When passed, this method will return false unless the value was # changed to the given value def saved_change_to_attribute?(attr_name, **options) - mutations_before_last_save.changed?(attr_name, **options) + mutations_before_last_save.changed?(attr_name.to_s, options) end # Returns the change to an attribute during the last save. If the @@ -63,7 +61,7 @@ module ActiveRecord # invoked as +saved_change_to_name+ instead of # <tt>saved_change_to_attribute("name")</tt>. def saved_change_to_attribute(attr_name) - mutations_before_last_save.change_to_attribute(attr_name) + mutations_before_last_save.change_to_attribute(attr_name.to_s) end # Returns the original value of an attribute before the last save. @@ -73,7 +71,7 @@ module ActiveRecord # invoked as +name_before_last_save+ instead of # <tt>attribute_before_last_save("name")</tt>. def attribute_before_last_save(attr_name) - mutations_before_last_save.original_value(attr_name) + mutations_before_last_save.original_value(attr_name.to_s) end # Did the last call to +save+ have any changes to change? @@ -101,7 +99,7 @@ module ActiveRecord # +to+ When passed, this method will return false unless the value will be # changed to the given value def will_save_change_to_attribute?(attr_name, **options) - mutations_from_database.changed?(attr_name, **options) + mutations_from_database.changed?(attr_name.to_s, options) end # Returns the change to an attribute that will be persisted during the @@ -115,7 +113,7 @@ module ActiveRecord # If the attribute will change, the result will be an array containing the # original value and the new value about to be saved. def attribute_change_to_be_saved(attr_name) - mutations_from_database.change_to_attribute(attr_name) + mutations_from_database.change_to_attribute(attr_name.to_s) end # Returns the value of an attribute in the database, as opposed to the @@ -127,7 +125,7 @@ module ActiveRecord # saved. It can be invoked as +name_in_database+ instead of # <tt>attribute_in_database("name")</tt>. def attribute_in_database(attr_name) - mutations_from_database.original_value(attr_name) + mutations_from_database.original_value(attr_name.to_s) end # Will the next call to +save+ have any changes to persist? diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb index 997b7f763a..ed0c6d48b8 100644 --- a/activerecord/lib/active_record/migration.rb +++ b/activerecord/lib/active_record/migration.rb @@ -6,7 +6,7 @@ require "zlib" require "active_support/core_ext/module/attribute_accessors" module ActiveRecord - class MigrationError < ActiveRecordError#:nodoc: + class MigrationError < ActiveRecordError #:nodoc: def initialize(message = nil) message = "\n\n#{message}\n\n" if message super @@ -87,7 +87,7 @@ module ActiveRecord class IrreversibleMigration < MigrationError end - class DuplicateMigrationVersionError < MigrationError#:nodoc: + class DuplicateMigrationVersionError < MigrationError #:nodoc: def initialize(version = nil) if version super("Multiple migrations have the version number #{version}.") @@ -97,7 +97,7 @@ module ActiveRecord end end - class DuplicateMigrationNameError < MigrationError#:nodoc: + class DuplicateMigrationNameError < MigrationError #:nodoc: def initialize(name = nil) if name super("Multiple migrations have the name #{name}.") @@ -117,7 +117,7 @@ module ActiveRecord end end - class IllegalMigrationNameError < MigrationError#:nodoc: + class IllegalMigrationNameError < MigrationError #:nodoc: def initialize(name = nil) if name super("Illegal name for migration file: #{name}\n\t(only lower case letters, numbers, and '_' allowed).") @@ -127,7 +127,7 @@ module ActiveRecord end end - class PendingMigrationError < MigrationError#:nodoc: + class PendingMigrationError < MigrationError #:nodoc: def initialize(message = nil) if !message && defined?(Rails.env) super("Migrations are pending. To resolve this issue, run:\n\n rails db:migrate RAILS_ENV=#{::Rails.env}") @@ -520,10 +520,10 @@ module ActiveRecord autoload :Compatibility, "active_record/migration/compatibility" # This must be defined before the inherited hook, below - class Current < Migration # :nodoc: + class Current < Migration #:nodoc: end - def self.inherited(subclass) # :nodoc: + def self.inherited(subclass) #:nodoc: super if subclass.superclass == Migration raise StandardError, "Directly inheriting from ActiveRecord::Migration is not supported. " \ @@ -541,7 +541,7 @@ module ActiveRecord ActiveRecord::VERSION::STRING.to_f end - MigrationFilenameRegexp = /\A([0-9]+)_([_a-z0-9]*)\.?([_a-z0-9]*)?\.rb\z/ # :nodoc: + MigrationFilenameRegexp = /\A([0-9]+)_([_a-z0-9]*)\.?([_a-z0-9]*)?\.rb\z/ #:nodoc: # This class is used to verify that all migrations have been run before # loading a web page if <tt>config.active_record.migration_error</tt> is set to :page_load @@ -568,10 +568,10 @@ module ActiveRecord end class << self - attr_accessor :delegate # :nodoc: - attr_accessor :disable_ddl_transaction # :nodoc: + attr_accessor :delegate #:nodoc: + attr_accessor :disable_ddl_transaction #:nodoc: - def nearest_delegate # :nodoc: + def nearest_delegate #:nodoc: delegate || superclass.nearest_delegate end @@ -595,13 +595,13 @@ module ActiveRecord end end - def maintain_test_schema! # :nodoc: + def maintain_test_schema! #:nodoc: if ActiveRecord::Base.maintain_test_schema suppress_messages { load_schema_if_pending! } end end - def method_missing(name, *args, &block) # :nodoc: + def method_missing(name, *args, &block) #:nodoc: nearest_delegate.send(name, *args, &block) end @@ -618,7 +618,7 @@ module ActiveRecord end end - def disable_ddl_transaction # :nodoc: + def disable_ddl_transaction #:nodoc: self.class.disable_ddl_transaction end @@ -693,7 +693,7 @@ module ActiveRecord connection.respond_to?(:reverting) && connection.reverting end - ReversibleBlockHelper = Struct.new(:reverting) do # :nodoc: + ReversibleBlockHelper = Struct.new(:reverting) do #:nodoc: def up yield unless reverting end @@ -1006,7 +1006,7 @@ module ActiveRecord end end - class MigrationContext # :nodoc: + class MigrationContext #:nodoc: attr_reader :migrations_paths def initialize(migrations_paths) @@ -1165,7 +1165,7 @@ module ActiveRecord end end - class Migrator # :nodoc: + class Migrator #:nodoc: class << self attr_accessor :migrations_paths diff --git a/activesupport/activesupport.gemspec b/activesupport/activesupport.gemspec index 546cc1797a..dd2340cdd3 100644 --- a/activesupport/activesupport.gemspec +++ b/activesupport/activesupport.gemspec @@ -34,5 +34,5 @@ Gem::Specification.new do |s| s.add_dependency "tzinfo", "~> 1.1" s.add_dependency "minitest", "~> 5.1" s.add_dependency "concurrent-ruby", "~> 1.0", ">= 1.0.2" - s.add_dependency "zeitwerk", "~> 2.1" + s.add_dependency "zeitwerk", "~> 2.1", ">= 2.1.2" end diff --git a/activesupport/lib/active_support/dependencies/zeitwerk_integration.rb b/activesupport/lib/active_support/dependencies/zeitwerk_integration.rb index b0f7a3f9cc..f16a9f7e57 100644 --- a/activesupport/lib/active_support/dependencies/zeitwerk_integration.rb +++ b/activesupport/lib/active_support/dependencies/zeitwerk_integration.rb @@ -9,7 +9,11 @@ module ActiveSupport module Decorations def clear Dependencies.unload_interlock do - Rails.autoloaders.main.reload + begin + Rails.autoloaders.main.reload + rescue Zeitwerk::ReloadingDisabledError + raise "reloading is disabled because config.cache_classes is true" + end end end diff --git a/guides/source/engines.md b/guides/source/engines.md index b79cf409d0..84a49bec9b 100644 --- a/guides/source/engines.md +++ b/guides/source/engines.md @@ -1396,7 +1396,7 @@ s.add_development_dependency "moo" Both kinds of dependencies will be installed when `bundle install` is run inside of the application. The development dependencies for the gem will only be used -when the tests for the engine are running. +when the development and tests for the engine are running. Note that if you want to immediately require dependencies when the engine is required, you should require them before the engine's initialization. For @@ -1531,4 +1531,6 @@ These are the available configuration hooks. They do not hook into any particula ### Example -`config.before_configuration { puts 'I am called before any initializers' }` +```ruby +config.before_configuration { puts 'I am called before any initializers' } +``` diff --git a/railties/test/application/zeitwerk_integration_test.rb b/railties/test/application/zeitwerk_integration_test.rb index b248459e47..40d06ee999 100644 --- a/railties/test/application/zeitwerk_integration_test.rb +++ b/railties/test/application/zeitwerk_integration_test.rb @@ -156,6 +156,15 @@ class ZeitwerkIntegrationTest < ActiveSupport::TestCase assert_not Rails.autoloaders.once.reloading_enabled? end + test "reloading raises if config.cache_classes is true" do + boot("production") + + e = assert_raises(StandardError) do + deps.clear + end + assert_equal "reloading is disabled because config.cache_classes is true", e.message + end + test "eager loading loads code in engines" do $test_blog_engine_eager_loaded = false diff --git a/railties/test/generators/actions_test.rb b/railties/test/generators/actions_test.rb index 44d4e92256..d913bb5438 100644 --- a/railties/test/generators/actions_test.rb +++ b/railties/test/generators/actions_test.rb @@ -200,7 +200,7 @@ class ActionsTest < Rails::Generators::TestCase run_generator action :environment do - _ = "# This wont be added"# assignment to silence parse-time warning "unused literal ignored" + _ = "# This wont be added" # assignment to silence parse-time warning "unused literal ignored" "# This will be added" end |