Ignore more parser warnings

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 "warnings"
+
+      Warnings.ignore :parser_syntax do
         require "rubocop"
+      end
+
       require "rubocops"
 
       args = %w[

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"

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

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

Library/Homebrew/warnings.rbi

@@ -0,0 +1,5 @@
+# typed: strict
+
+module Warnings
+  include Kernel
+end