From cdffe7106e0c0354288e361494d5806ce489ef74 Mon Sep 17 00:00:00 2001
From: Ryan Culpepper <ryanc@racket-lang.org>
Date: Fri, 23 Oct 2015 18:30:44 -0400
Subject: [PATCH] fix grammar

---
 macro-debugger-text-lib/macro-debugger/model/deriv-parser.rkt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/macro-debugger-text-lib/macro-debugger/model/deriv-parser.rkt b/macro-debugger-text-lib/macro-debugger/model/deriv-parser.rkt
index 993a767..862b7bf 100644
--- a/macro-debugger-text-lib/macro-debugger/model/deriv-parser.rkt
+++ b/macro-debugger-text-lib/macro-debugger/model/deriv-parser.rkt
@@ -554,8 +554,8 @@
     ;; then the body is processed as a list (since it has already been
     ;; processed as a block)
     (EB/EL
-     [(EB) $1]
-     [(EL) $1])
+     [((? EB)) $1]
+     [((? EL)) $1])
 
     ;; Blocks
     ;; EB Answer = BlockDerivation