Package: x11-xserver-utils
Version: 7.3+2
Your parser is broken.
$ man X
The precise syntax for resources is:
ResourceLine = Comment | IncludeFile | ResourceSpec | <empty line>
Comment = "!" {<any character except null or newline>}
"Any character except null or newline".
However:
$ head -n 1 .Xresources
! .Xresources -- Dan Jacobson's personal version
$ xrdb .Xresources
<stdin>:1:30: warning: missing terminating ' character