I did a diff of the source code for a SERP for "${" and a SERP for "$$", ignored...

cfinke on Sept 16, 2011 | parent | context | favorite | on: Break Google

I did a diff of the source code for a SERP for "${" and a SERP for "$$", ignored any lines that were the same except for s/${/$$/, and then un-minified with http://jsbeautifier.org/