Guardfile in opal-0.11.4 vs Guardfile in opal-1.0.0.beta1

@@ -47,10 +47,9 @@
   def run_on_changes(changes)
     m = changes
     path = m[0]
     puts color("Searching specs for #{m[0]}...", :yellow)
     case path
-    when %r{grammar\.y$}  then system 'rake racc'
     when %r{^spec/lib}     then rspec path
     when %r{^spec/ruby} then mspec path
     when %r{^opal/corelib}
       name = File.basename(path, '.rb')
       mspec "spec/ruby/core/#{name}/**/*_spec.rb"