From d10193d65b19ff977a30cd5de4aa7ba640e0f795 Mon Sep 17 00:00:00 2001
From: Mathias <mathias@spray.cc>
Date: Tue, 19 Jul 2011 11:00:03 +0200
Subject: Improve compile time error messages with @implicitNotFound
 annotations

---
 src/main/scala/cc/spray/json/JsonFormat.scala | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/scala/cc/spray/json/JsonFormat.scala b/src/main/scala/cc/spray/json/JsonFormat.scala
index 0fedd3f..c5bc53e 100644
--- a/src/main/scala/cc/spray/json/JsonFormat.scala
+++ b/src/main/scala/cc/spray/json/JsonFormat.scala
@@ -17,9 +17,12 @@
 
 package cc.spray.json
 
+import annotation.implicitNotFound
+
 /**
   * Provides the JSON deserialization for type T.
  */
+@implicitNotFound(msg = "Cannot find JsonReader or JsonFormat type class for ${T}")
 trait JsonReader[T] {
   def read(json: JsValue): T
 }
@@ -33,6 +36,7 @@ object JsonReader {
 /**
   * Provides the JSON serialization for type T.
  */
+@implicitNotFound(msg = "Cannot find JsonWriter or JsonFormat type class for ${T}")
 trait JsonWriter[T] {
   def write(obj: T): JsValue
 }
-- 
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