From fe80b398b55d301364b2fc421cd32d931bc7e713 Mon Sep 17 00:00:00 2001
From: Mike Gerwitz <mtg@gnu.org>
Date: Wed, 30 Aug 2017 00:20:54 -0400
Subject: [PATCH] prebirth: Correct token value parsing

Empty string was not matching, which was causing its value to be '""', which
expanded (in JS) into the compiled string '""""'.  Oops.

* build-aux/bootstrap/prebirth.js (Parser#_token): Distinguish empty values
    from non-matches.
---
 build-aux/bootstrap/prebirth.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build-aux/bootstrap/prebirth.js b/build-aux/bootstrap/prebirth.js
index a11fdd0..ae70d3b 100644
--- a/build-aux/bootstrap/prebirth.js
+++ b/build-aux/bootstrap/prebirth.js
@@ -268,7 +268,7 @@ class Parser
         const token = {
             type:   type,
             lexeme: lexeme,
-            value:  value || lexeme,
+            value:  ( value === undefined ) ? lexeme : value,
             pos:    pos
         };