Document file
option for ruby
directive
#1291
Merged
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Feature was implemented in rubygems/rubygems#6876 and documented on the
manpage
but it seems like it makes sense to have on this page as well, as it is the top google result for "gemfile ruby version".
This copy is lifted (and lightly edited) from the manpage source https://github.com/rubygems/rubygems/blob/6bbc8bed344eeaadcbd8dfcc6e20c9e1eb734d96/bundler/lib/bundler/man/gemfile.5.ronn?plain=1#L72-L80