vim-ruby/vim-ruby — pull request #141 by ngollan (2013-03-13 09:49:29+00:00)
Title: Highlight Ruby 2.0 symbol array syntax (%i)

That functionality is highly addictive.

The patch supports highlighting for %i and %I (you can create symbol arrays with interpolation!) by simply adding the characters to the start expressions for %q and %w.