On Mon, Feb 13, 2012 at 7:10 PM, NARUSE, Yui <naruse / airemix.jp> wrote:
> It is in test/ruby/test_sprintf.rb as a test of sprintf.
> But it should have more tests...

Ahh thank you.

I sent a pull request for trivial %<foo> specs to RubySpec here:
https://github.com/rubyspec/rubyspec/pull/120

A previous pull request for %{foo} was already merged in.

- Charlie