procs

code/game/objects/effects/effect_system/effect_system.dm

@@ -72,7 +72,7 @@ would spawn and follow the beaker, even if it is carried or thrown.
 		sleep(5)
 		step(E,direction)
 	if(!QDELETED(src))
-		addtimer(CALLBACK(src, .proc/decrement_total_effect), 20)
+		addtimer(CALLBACK(src, PROC_REF(decrement_total_effect)), 20)
 
 /datum/effect_system/proc/decrement_total_effect()
 	total_effects--

code/game/objects/effects/effect_system/effects_explosion.dm

@@ -17,7 +17,7 @@
 		var/direct = pick(GLOB.alldirs)
 		var/steps_amt = pick(1;25,2;50,3,4;200)
 		for(var/j in 1 to steps_amt)
-			addtimer(CALLBACK(GLOBAL_PROC, .proc/_step, expl, direct), j)
+			addtimer(CALLBACK(GLOBAL_PROC, GLOBAL_PROC_REF(_step), expl, direct), j)
 
 /obj/effect/explosion
 	name = "fire"
@@ -55,4 +55,4 @@
 	S.start()
 /datum/effect_system/explosion/smoke/start()
 	..()
-	addtimer(CALLBACK(src, .proc/create_smoke), 5)
+	addtimer(CALLBACK(src, PROC_REF(create_smoke)), 5)

code/game/objects/effects/effect_system/effects_foam.dm

@@ -315,7 +315,7 @@
 /obj/structure/foamedmetal/resin/Initialize(mapload)
 	. = ..()
 	neutralize_air()
-	addtimer(CALLBACK(src, .proc/neutralize_air), 5)		// yeah this sucks, maybe when auxmos is out
+	addtimer(CALLBACK(src, PROC_REF(neutralize_air)), 5)		// yeah this sucks, maybe when auxmos is out
 
 /obj/structure/foamedmetal/resin/proc/neutralize_air()
 	if(isopenturf(loc))

code/game/objects/effects/effect_system/effects_smoke.dm

@@ -64,7 +64,7 @@
 	if(C.smoke_delay)
 		return 0
 	C.smoke_delay++
-	addtimer(CALLBACK(src, .proc/remove_smoke_delay, C), 10)
+	addtimer(CALLBACK(src, PROC_REF(remove_smoke_delay), C), 10)
 	return 1
 
 /obj/effect/particle_effect/smoke/proc/remove_smoke_delay(mob/living/carbon/C)