From 4096d4996e6fb6212c603c9a99bd712ebbb9409f Mon Sep 17 00:00:00 2001
From: Taylor R Campbell <campbell@mumble.net>
Date: Wed, 28 Nov 2018 02:58:46 +0000
Subject: [PATCH] Test for miscompilation of optional arguments.

---
 tests/check.scm                 |  3 +++
 tests/runtime/test-optional.scm | 44 +++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 tests/runtime/test-optional.scm

diff --git a/tests/check.scm b/tests/check.scm
index ed0bdb0f8..3c54d919c 100644
--- a/tests/check.scm
+++ b/tests/check.scm
@@ -74,6 +74,9 @@ USA.
     "runtime/test-md5"
     "runtime/test-mime-codec"
     "runtime/test-numpar"
+    "runtime/test-optional"
+    "runtime/test-optional.bin"
+    "runtime/test-optional.com"
     ("runtime/test-parametric-predicate" (runtime parametric-predicate))
     "runtime/test-predicate"
     ("runtime/test-predicate-dispatch" (runtime predicate-dispatch))
diff --git a/tests/runtime/test-optional.scm b/tests/runtime/test-optional.scm
new file mode 100644
index 000000000..ffb6a7b75
--- /dev/null
+++ b/tests/runtime/test-optional.scm
@@ -0,0 +1,44 @@
+#| -*-Scheme-*-
+
+Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
+    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+    2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
+    2017, 2018 Massachusetts Institute of Technology
+
+This file is part of MIT/GNU Scheme.
+
+MIT/GNU Scheme is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+
+MIT/GNU Scheme is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with MIT/GNU Scheme; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
+USA.
+
+|#
+
+;;;; Test for optional arguments
+
+(declare (usual-integrations))
+
+(define-test 'unused-local-optional
+  (lambda ()
+    (define (fixit x)
+      ;; Avoid crash if test harness is interpreted.
+      (map-reference-trap (lambda () x)))
+    (define (test)
+      (define (local #!optional arg)
+        (assert-eqv (fixit arg) #!default))
+      (local))
+    ;; Compiler incorrectly passes unassigned reference trap if
+    ;; argument is never passed.
+    (if (compiled-procedure? test)
+        (expect-failure test)
+        (test))))
-- 
2.25.1