Rakefile in rmagick-5.4.4 vs Rakefile in rmagick-5.5.0

@@ -141,9 +141,20 @@
       file_to_html('doc/ex', file_name, PATH_TO_LOCAL_WEBSITE_REPOSITORY, "#{file_name}.html")
     end
   end
 end
 
+namespace :rbs do
+  desc 'Validate RBS definitions'
+  task :validate do
+    all_sigs = Dir.glob('sig').map { |dir| "-I #{dir}" }.join(' ')
+    sh("bundle exec rbs #{all_sigs} validate") do |ok, _|
+      abort('one or more rbs validate failed') unless ok
+    end
+  end
+end
+
+require 'bundler/gem_tasks'
 require 'rake/extensiontask'
 require 'rspec/core/rake_task'
 RSpec::Core::RakeTask.new(:spec)
 
 Rake::ExtensionTask.new('RMagick2') do |ext|