D-Programming-Language/phobos — pull request #812 by gward (2012-09-21 18:27:37+00:00)
Title: std.process: Fix documentation for exec*() functions.

They really are just like POSIX exec*(), i.e. they do not return an
exit status. In fact, they don't return at all on success.
Unfortunately, it looks like all you get on failure is a return value
of -1, no indication of whether the failure was "No such file or
directory", "Permission denied", etc.