From 63fbdb394bc90595f2e9df6a7e387ede36662f18 Mon Sep 17 00:00:00 2001
From: RogueException <rogueexception@gmail.com>
Date: Mon, 27 Jun 2016 07:07:56 -0300
Subject: [PATCH] Ensure Task return type for commands

---
 src/Discord.Net.Commands/Command.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Discord.Net.Commands/Command.cs b/src/Discord.Net.Commands/Command.cs
index 53c4758d5..f9578d154 100644
--- a/src/Discord.Net.Commands/Command.cs
+++ b/src/Discord.Net.Commands/Command.cs
@@ -81,7 +81,7 @@ namespace Discord.Commands
 
                 var reader = Module.Service.GetTypeReader(type);
                 if (reader == null)
-                    throw new InvalidOperationException($"This type ({type.FullName}) is not supported.");
+                    throw new InvalidOperationException($"{type.FullName} is not supported as a command parameter, are you missing a TypeReader?");
 
                 bool isUnparsed = parameter.GetCustomAttribute<UnparsedAttribute>() != null;
                 if (isUnparsed)
@@ -103,6 +103,9 @@ namespace Discord.Commands
         }
         private Func<IMessage, IReadOnlyList<object>, Task> BuildAction(MethodInfo methodInfo)
         {
+            if (methodInfo.ReturnType != typeof(Task))
+                throw new InvalidOperationException("Commands must return a non-generic Task.");
+
             //TODO: Temporary reflection hack. Lets build an actual expression tree here.
             return (msg, args) =>
             {