$ heroku stack:set cedar-14
したらどうなるかのう
Fetching idn-ruby 0.1.0
Installing idn-ruby 0.1.0 with native extensions
お。通った。heroku-16だけダメなんかな。
ちごた。だめだ。
Fetching redis-namespace 1.5.3
Installing redis-namespace 1.5.3
The latest bundler is 1.15.3, but you are currently running 1.15.2.
To update, run `gem install bundler`
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory:
/tmp/…/vendor/bundle/ruby/2.4.0/gems/idn-ruby-0.1.0/ext
/tmp/…/vendor/ruby-2.4.1/bin/ruby
-r ./siteconf20170731-1521-5hru17.rb extconf.rb