Rakefile in rbs-1.7.0.beta.2 vs Rakefile in rbs-1.7.0.beta.3

@@ -19,9 +19,24 @@
   end
 end
 
 multitask :default => [:test, :stdlib_test, :rubocop, :validate, :test_doc]
 
+task :lexer do
+  sh "re2c -W --no-generation-date -o ext/rbs_extension/lexer.c ext/rbs_extension/lexer.re"
+end
+
+task :confirm_lexer => :lexer do
+  puts "Testing if lexer.c is updated with respect to lexer.re"
+  sh "git diff --exit-code ext/rbs_extension/lexer.c"
+end
+
+rule ".c" => ".re" do |t|
+  puts "⚠️⚠️⚠️ #{t.name} is older than #{t.source}. You may need to run `rake lexer` ⚠️⚠️⚠️"
+end
+
+task :compile => "ext/rbs_extension/lexer.c"
+
 task :test_doc do
   files = Dir.chdir(File.expand_path('..', __FILE__)) do
     `git ls-files -z`.split("\x0").select do |file| Pathname(file).extname == ".md" end
   end