phobos commit, revision 1931


user: schveiguy

msg:
changed appender to prevent calling .clear on appenders of immutable or const data.

Removed buffer arg from std.xml.encode since most of the time the data is string data, and the buffer was defined as the same type.

Fixed std.format unittests to not use string-based appenders, since they now cannot be rewritten.

http://www.dsource.org/projects/phobos/changeset/1931