D-Programming-Language/dmd — pull request #1643 by donc (2013-02-08 16:03:25+00:00)
Title: D1 ONLY: Make missing return an error instead of a warning

The implementation in D2 has been a resounding success. There is no reason for this to remain a warning, it is an error in 100% of cases -- and it's a particularly common and dangerous bug.