--- a/examples/blog/src/lib/Post.luan	Tue Feb 06 22:04:47 2018 -0700
+++ b/examples/blog/src/lib/Post.luan	Wed Feb 07 17:36:38 2018 -0700
@@ -1,7 +1,7 @@
 local Luan = require "luan:Luan.luan"
 local error = Luan.error
 local ipairs = Luan.ipairs or error()
-local assert_string = Luan.assert_string or error()
+local type = Luan.type or error()
 local Time = require "luan:Time.luan"
 local now = Time.now or error()
 local String = require "luan:String.luan"
@@ -21,8 +21,8 @@
 end
 
 function Post.new(this)
-	assert_string(this.subject)
-	assert_string(this.content)
+	type(this.subject)=="string" or error "subject must be string"
+	type(this.content)=="string" or error "content must be string"
 	this.date = this.date or now()
 
 	function this.save()