From 0aa96c799ae64f0cfae1d775d0e29bdb8514ff4a Mon Sep 17 00:00:00 2001
From: Bryan Mulvihill <mulvihill@informz.com>
Date: Sun, 31 Dec 2017 13:26:38 -0500
Subject: [PATCH] [spec] Fix generic expect_raises

---
 stdlib/spec/single_spec.mt | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/stdlib/spec/single_spec.mt b/stdlib/spec/single_spec.mt
index cd30103..796e8a2 100644
--- a/stdlib/spec/single_spec.mt
+++ b/stdlib/spec/single_spec.mt
@@ -44,9 +44,14 @@ defmodule Spec
     # a specific error.
     def expect_raises(&block)
       block()
-      raise %AssertionFailure{@name, expected_error, "no error"}
+      raise %AssertionFailure{@name, "Any Error", "no error"}
+    rescue ex : AssertionFailure
+      # Rescuing an AssertionFailure implies that `block` did
+      # not raise an exception, so the exception is re-raised.
+      raise ex
     rescue
-      # If an error was raised, the assertion passes.
+      # Otherwise, the error must have come from `block`, so the
+      # assertion is successful.
     end
   end
 end