steveklabnik/rust_for_rubyists — pull request #39 by bcj (2014-01-15 00:53:23+00:00)
Title: BUGFIX: in 0.9 `do` takes a proc not a closure

The `do` syntax changed in 0.9, causing the code to fail with ``last argument in `do` call has non-procedure type: ||``

The code now runs (but may not be idiomatic).