loadstone bit

If your inventory is full and you aren't already carrying a loadstone,
you can pick one up into the overflow slot.  But if you are already
carrying one and the one you're trying to pick up won't merge with it
(only criterium that matters would be BUC state, I think), you can't
pick it up and get a message saying so.  If loadstone isn't known
yet, the message always referred to it as "gray stone" rather than
"stone called <whatever-you-called-it>".

src/pickup.c

@@ -1702,9 +1702,12 @@ lift_object(
             || merge_choice(gi.invent, obj))
             return 1; /* lift regardless of current situation */
         /* if we reach here, we're out of slots and already have at least
-           one of these, so treat this one more like a normal item */
+           one of these, so treat this one more like a normal item
+           [this was using simpleonames(obj) for shortest description, but
+           that's suboptimal for loadstones because it omits user-assigned
+           type name which is something of interest for gray stones] */
         You("are carrying too much stuff to pick up %s %s.",
-            (obj->quan == 1L) ? "another" : "more", simpleonames(obj));
+            (obj->quan == 1L) ? "another" : "more", xname(obj));
         return -1;
     }