Avoid dead code warning with async(throw T)

By declararing the parameter of `async` as by-name.

Fixes #150 (the bug in the original ticket.)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main/scala/scala/async/Async.scala b/src/main/scala/scala/async/Async.scala
index bacf70a..0bba6ed 100644
--- a/src/main/scala/scala/async/Async.scala
+++ b/src/main/scala/scala/async/Async.scala
@@ -42,7 +42,7 @@ object Async {
    * Run the block of code `body` asynchronously. `body` may contain calls to `await` when the results of
    * a `Future` are needed; this is translated into non-blocking code.
    */
-  def async[T](body: T)(implicit execContext: ExecutionContext): Future[T] = macro internal.ScalaConcurrentAsync.asyncImpl[T]
+  def async[T](body: => T)(implicit execContext: ExecutionContext): Future[T] = macro internal.ScalaConcurrentAsync.asyncImpl[T]
 
   /**
    * Non-blocking await the on result of `awaitable`. This may only be used directly within an enclosing `async` block.