diff --git a/Library/Homebrew/brew.sh b/Library/Homebrew/brew.sh
index 7feeac9f23..9c4326f309 100644
--- a/Library/Homebrew/brew.sh
+++ b/Library/Homebrew/brew.sh
@@ -576,7 +576,7 @@ fi
 
 if [[ -z "$HOMEBREW_RUBY_WARNINGS" ]]
 then
-  export HOMEBREW_RUBY_WARNINGS="-W0"
+  export HOMEBREW_RUBY_WARNINGS="-W1"
 fi
 
 if [[ -z "$HOMEBREW_BOTTLE_DOMAIN" ]]
diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 80c31d5210..50db47d6e2 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -71,25 +71,29 @@ class AbstractDownloadStrategy
   # Unlike {Resource#stage}, this does not take a block.
   #
   # @api public
-  def stage
+  def stage(&block)
     UnpackStrategy.detect(cached_location,
                           prioritise_extension: true,
                           ref_type: @ref_type, ref: @ref)
                   .extract_nestedly(basename:             basename,
                                     prioritise_extension: true,
                                     verbose:              verbose? && !quiet?)
-    chdir
+    chdir(&block)
   end
 
-  def chdir
+  def chdir(&block)
     entries = Dir["*"]
     raise "Empty archive" if entries.length.zero?
-    return if entries.length != 1
 
-    begin
-      Dir.chdir entries.first
-    rescue
-      nil
+    if entries.length != 1
+      yield if block
+      return
+    end
+
+    if File.directory? entries.first
+      Dir.chdir(entries.first, &block)
+    elsif block
+      yield
     end
   end
   private :chdir
diff --git a/Library/Homebrew/resource.rb b/Library/Homebrew/resource.rb
index 47920e13c8..bcd4a97ef2 100644
--- a/Library/Homebrew/resource.rb
+++ b/Library/Homebrew/resource.rb
@@ -114,14 +114,15 @@ class Resource
   # A target or a block must be given, but not both.
   def unpack(target = nil)
     mktemp(download_name) do |staging|
-      downloader.stage
-      @source_modified_time = downloader.source_modified_time
-      apply_patches
-      if block_given?
-        yield ResourceStageContext.new(self, staging)
-      elsif target
-        target = Pathname(target)
-        target.install Pathname.pwd.children
+      downloader.stage do
+        @source_modified_time = downloader.source_modified_time
+        apply_patches
+        if block_given?
+          yield ResourceStageContext.new(self, staging)
+        elsif target
+          target = Pathname(target)
+          target.install Pathname.pwd.children
+        end
       end
     end
   end
diff --git a/Library/Homebrew/style.rb b/Library/Homebrew/style.rb
index 32a46a3471..7511754fdb 100644
--- a/Library/Homebrew/style.rb
+++ b/Library/Homebrew/style.rb
@@ -78,7 +78,13 @@ module Homebrew
                     fix: false, except_cops: nil, only_cops: nil, display_cop_names: false, reset_cache: false,
                     debug: false, verbose: false)
       Homebrew.install_bundler_gems!
-      require "rubocop"
+
+      require "warnings"
+
+      Warnings.ignore :parser_syntax do
+        require "rubocop"
+      end
+
       require "rubocops"
 
       args = %w[
diff --git a/Library/Homebrew/test/spec_helper.rb b/Library/Homebrew/test/spec_helper.rb
index 7b7b3bfe3c..7c2def7835 100644
--- a/Library/Homebrew/test/spec_helper.rb
+++ b/Library/Homebrew/test/spec_helper.rb
@@ -23,12 +23,17 @@ if ENV["HOMEBREW_TESTS_COVERAGE"]
   SimpleCov.formatters = SimpleCov::Formatter::MultiFormatter.new(formatters)
 end
 
+require_relative "../warnings"
+
+Warnings.ignore :parser_syntax do
+  require "rubocop"
+end
+
 require "rspec/its"
 require "rspec/github"
 require "rspec/wait"
 require "rspec/retry"
 require "rspec/sorbet"
-require "rubocop"
 require "rubocop/rspec/support"
 require "find"
 require "byebug"
diff --git a/Library/Homebrew/utils/rubocop.rb b/Library/Homebrew/utils/rubocop.rb
index e1fb8fb857..2257c8bb31 100755
--- a/Library/Homebrew/utils/rubocop.rb
+++ b/Library/Homebrew/utils/rubocop.rb
@@ -2,18 +2,10 @@
 # typed: false
 # frozen_string_literal: true
 
-require "warning"
+require_relative "../warnings"
 
-warnings = [
-  %r{warning: parser/current is loading parser/ruby\d+, which recognizes},
-  /warning: \d+\.\d+\.\d+-compliant syntax, but you are running \d+\.\d+\.\d+\./,
-  %r{warning: please see https://github\.com/whitequark/parser#compatibility-with-ruby-mri\.},
-]
-
-warnings.each do |warning|
-  Warning.ignore warning
+Warnings.ignore :parser_syntax do
+  require "rubocop"
 end
 
-require "rubocop"
-
 exit RuboCop::CLI.new.run
diff --git a/Library/Homebrew/warnings.rb b/Library/Homebrew/warnings.rb
new file mode 100644
index 0000000000..f0a3ed116f
--- /dev/null
+++ b/Library/Homebrew/warnings.rb
@@ -0,0 +1,36 @@
+# typed: true
+# frozen_string_literal: true
+
+require "warning"
+
+# Helper module for handling warnings.
+#
+# @api private
+module Warnings
+  module_function
+
+  COMMON_WARNINGS = {
+    parser_syntax: [
+      %r{warning: parser/current is loading parser/ruby\d+, which recognizes},
+      /warning: \d+\.\d+\.\d+-compliant syntax, but you are running \d+\.\d+\.\d+\./,
+      %r{warning: please see https://github\.com/whitequark/parser#compatibility-with-ruby-mri\.},
+    ],
+  }.freeze
+
+  def ignore(*warnings)
+    warnings.map! do |warning|
+      next warning if !warning.is_a?(Symbol) || !COMMON_WARNINGS.key?(warning)
+
+      COMMON_WARNINGS[warning]
+    end
+
+    warnings.flatten.each do |warning|
+      Warning.ignore warning
+    end
+    return unless block_given?
+
+    result = yield
+    Warning.clear
+    result
+  end
+end
diff --git a/Library/Homebrew/warnings.rbi b/Library/Homebrew/warnings.rbi
new file mode 100644
index 0000000000..5d83b4cc35
--- /dev/null
+++ b/Library/Homebrew/warnings.rbi
@@ -0,0 +1,5 @@
+# typed: strict
+
+module Warnings
+  include Kernel
+end