EllisLab/CodeIgniter — pull request #2815 by fredemmott (2014-01-13 22:58:42+00:00)
Title: Don't throw in mock autoloader

This behavior doesn't appear to be used at all.

This fixes HHVM compatibility: HHVM optimizes class_exists() to a
dedicated bytecode - as it's not a function call, it doesn't show up
in the backtrace. 100% of the tests pass with this change.