petdance/ack2 — pull request #247 by mmcclimon (2013-04-23 01:57:59+00:00)
Title: Optimization (faster to check flag).

Checking a flag for opening is a lot faster than checking if the
filehandle is defined. Speeds up nytprof target from 7.05s to 4.89s by dramatically cutting the number of subroutine calls.