Thanks. Now it says "Lisp_String".
(gdb) xstring
$18 = (struct Lisp_String *) 0x33a14e0
"(nilory is relative, it is com"
(gdb) p string
$19 = 54138084
(gdb) xtype
Lisp_String
(gdb)
I think you have to use xtype before xstring (otherwise it applies to
$16, the return value from xstring).