rebol/r3 — pull request #66 by earl (2013-01-19 02:07:19+00:00)
Title: Fix crash when reading dns:// without a hostname

Previously, `read dns://` crashed the interpreter. With this fix, a dns:// spec without a hostname (or IPv4 address) is considered invalid for READ access:

>> read dns://
** Access error: invalid spec or options: dns://

Fixes the crash reported in [CureCode issue #1935](http://issue.cc/r3/1935).