Rakefile in rbs-0.16.0 vs Rakefile in rbs-0.17.0

@@ -27,11 +27,11 @@
 task :validate => :parser do
   sh "#{ruby} #{rbs} validate --silent"
 
   FileList["stdlib/*"].each do |path|
     next if path =~ %r{stdlib/builtin}
-    
+
     lib = [File.basename(path).to_s]
 
     if lib == ["bigdecimal-math"]
       lib << "bigdecimal"
     end
@@ -57,9 +57,15 @@
 
 task :parser => "lib/rbs/parser.rb"
 task :test => :parser
 task :stdlib_test => :parser
 task :build => :parser
+
+task :confirm_parser do
+  puts "Testing if parser.rb is updated with respect to parser.y"
+  sh "racc -v -o lib/rbs/parser.rb lib/rbs/parser.y"
+  sh "git diff --exit-code lib/rbs/parser.rb"
+end
 
 namespace :generate do
   task :stdlib_test, [:class] do |_task, args|
     klass = args.fetch(:class) do
       raise "Class name is necessary. e.g. rake 'generate:stdlib_test[String]'"