Adds GetTypeInAllContents, which should be self-explanatory. Recursively checks for a typepath locating in an atom.

It's used by cavity implants to make sure you can't slip the nuke disk in.

code/__HELPERS/unsorted.dm

@@ -627,6 +627,7 @@ proc/anim(turf/location as turf,target as mob|obj,a_icon,a_icon_state as text,fl
 	sleep(max(sleeptime, 15))
 	del(animation)
 
+
 //Will return the contents of an atom recursivly to a depth of 'searchDepth'
 /atom/proc/GetAllContents(searchDepth = 5)
 	var/list/toReturn = list()
@@ -638,6 +639,17 @@ proc/anim(turf/location as turf,target as mob|obj,a_icon,a_icon_state as text,fl
 
 	return toReturn
 
+
+/atom/proc/GetTypeInAllContents(typepath, searchDepth = 5)
+	for(var/atom/part in contents)
+		if(istype(part, typepath))
+			return 1
+		if(part.contents.len && searchDepth)
+			if(part.GetTypeInAllContents(typepath, searchDepth - 1))
+				return 1
+	return 0
+
+
 //Step-towards method of determining whether one atom can see another. Similar to viewers()
 /proc/can_see(var/atom/source, var/atom/target, var/length=5) // I couldnt be arsed to do actual raycasting :I This is horribly inaccurate.
 	var/turf/current = get_turf(source)

code/modules/surgery/cavity_implant.dm

@@ -24,7 +24,7 @@
 
 /datum/surgery_step/handle_cavity/success(mob/user, mob/living/carbon/target, target_zone, obj/item/tool, datum/surgery/surgery)
 	if(tool)
-		if(IC || tool.w_class > 3 || istype(tool, /obj/item/weapon/disk/nuclear) || istype(tool, /obj/item/organ))
+		if(IC || tool.w_class > 3 || tool.GetTypeInAllContents(/obj/item/weapon/disk/nuclear) || istype(tool, /obj/item/organ))
 			user.visible_message("<span class='notice'>[user] can't seem to fit [tool] in [target]'s [target_zone].</span>")
 			return 0
 		else