From 8f108c1aa8cac656da56b2505519db47080d5a26 Mon Sep 17 00:00:00 2001
From: Albert Magyar
Date: Mon, 4 Nov 2019 12:34:13 -0800
Subject: Add explicit EOF to top-level parser rule (#1217)

* Fixes #1154
* Tests that #1154 example produces SyntaxErrorsException
* Generally helps catch trailing syntax errors
* Performance-neutral relative to previous grammar
* Recommended by antlr4 devs, can help performance in some cases
* See antlr/antlr4#1540---
 src/main/antlr4/FIRRTL.g4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/main')

diff --git a/src/main/antlr4/FIRRTL.g4 b/src/main/antlr4/FIRRTL.g4
index 518cb698..0035423b 100644
--- a/src/main/antlr4/FIRRTL.g4
+++ b/src/main/antlr4/FIRRTL.g4
@@ -29,7 +29,7 @@ import firrtl.LexerHelper;
 
 // Does there have to be at least one module?
 circuit
-  : 'circuit' id ':' info? INDENT module* DEDENT
+  : 'circuit' id ':' info? INDENT module* DEDENT EOF
   ;
 
 module
-- 
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