big refactoring

util/core.lua

@@ -33,9 +33,9 @@ end
 do
 	local state
 	local function f()
-		local tmp = state
+		local temp = state
 		state = nil
-		return tmp
+		return temp
 	end
 	function public.present(v)
 		state = v; return f
@@ -201,16 +201,6 @@ function public.map(xs, f)
 	return ys
 end
 
-do
-	local mt = {__call = function(self, key) return self[key] end}
-	function public.set(t)
-		local self = {}
-		for i=1,getn(t) do self[t[i]] = true end
-		recycle(t)
-		return setmetatable(self, mt)
-	end
-end
-
 function public.trim(str)
 	return gsub(str, '^%s*(.-)%s*$', '%1')
 end