According to coverage at 
http://arstechnica.com/apple/reviews/2009/08/mac-os-x-10-6.ars/10
, Snow Leopard, the latest version of Mac OS X, added "blocks" to C.
The article illustrates this new language construct with the by-now
canonical ARM and home-grown-control-structure examples.

Hey, Java! Closures to the left of me [JRuby, Scala, etc.], blocks to
the right [C on OS X], here I am, stuck in the middle with you!
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