D-Programming-Language/phobos — pull request #1185 by AndrejMitrovic (2013-03-01 20:52:08+00:00)
Title: Issue 9265 - assertNotThrown should emit msg from thrown exception if available.

http://d.puremagic.com/issues/show_bug.cgi?id=9625

This will print either the user-specified message, the thrown message, or a period if neither are available (in that order).

This makes it simpler to investigate why an `assertNotThrown` has failed when used with exceptions that have their `msg` field set.