From a1591897df8c7dfc6d51b75c491685f331270b4e Mon Sep 17 00:00:00 2001
From: Matthew Butterick <mbutterick@users.noreply.github.com>
Date: Mon, 20 Jul 2015 20:58:36 -0700
Subject: [PATCH] Test against HEAD but allow failures

---
 .travis.yml | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index c1734f0..81f14f8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,9 +12,16 @@ env:
     - RACKET_VERSION=6.0
     - RACKET_VERSION=6.1
     - RACKET_VERSION=6.2
-#    - RACKET_VERSION=HEAD
+    - RACKET_VERSION=HEAD
 
+# You may want to test against certain versions of Racket, without
+# having them count against the overall success/failure.
 matrix:
+  allow_failures:
+    - env: RACKET_VERSION=HEAD
+  # Fast finish: Overall build result is determined as soon as any of
+  # its rows have failed, or, all of its rows that aren't allowed to
+  # fail have succeeded.
   fast_finish: true
 
 before_install: