From d54b902441e6ac6919c0f882b7172b1d36de5a99 Mon Sep 17 00:00:00 2001
From: Dominik Picheta <dominikpicheta@googlemail.com>
Date: Sat, 24 May 2014 15:51:41 +0100
Subject: [PATCH] Modified future behaviour when completing with an exception.

Futures will now raise the exception if they did not have a callback
associated with them.
---
 lib/pure/asyncdispatch.nim | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/pure/asyncdispatch.nim b/lib/pure/asyncdispatch.nim
index d972592a5c..9f1711f088 100644
--- a/lib/pure/asyncdispatch.nim
+++ b/lib/pure/asyncdispatch.nim
@@ -71,6 +71,11 @@ proc fail*[T](future: PFuture[T], error: ref EBase) =
   future.error = error
   if future.cb != nil:
     future.cb()
+  else:
+    # This is to prevent exceptions from being silently ignored when a future
+    # is discarded.
+    # TODO: This may turn out to be a bad idea.
+    raise error
 
 proc `callback=`*(future: PFutureBase, cb: proc () {.closure,gcsafe.}) =
   ## Sets the callback proc to be called when the future completes.