From 9e865d198230b30f944e19e79df0d789d20e58c5 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sat, 1 May 2021 09:40:22 -0400
Subject: [PATCH] Throw error on unexpected grammar input line

---
 lib/imbecile/grammar.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/imbecile/grammar.rb b/lib/imbecile/grammar.rb
index b1c4fbe..11b1d2d 100644
--- a/lib/imbecile/grammar.rb
+++ b/lib/imbecile/grammar.rb
@@ -27,8 +27,12 @@ module Imbecile
             return false
           end
           @tokens[name] = expr
+        else
+          $stderr.puts "Unexpected input on line #{line_number}: #{line}"
+          return false
         end
       end
+      true
     end
 
   end