From 92037a32a65b89b977d012047fc19255757f699b Mon Sep 17 00:00:00 2001
From: Amaan Qureshi <amaanq12@gmail.com>
Date: Tue, 22 Aug 2023 00:13:41 -0400
Subject: [PATCH] fix: (()) is allowed as a null value, a number's base might
 be an expansion

---
 grammar.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/grammar.js b/grammar.js
index 16f1741cf..91cdf7b75 100644
--- a/grammar.js
+++ b/grammar.js
@@ -353,7 +353,7 @@ module.exports = grammar({
       choice(
         seq('[', choice($._expression, $.redirected_statement), ']'),
         seq('[[', $._expression, ']]'),
-        seq('(', '(', $._expression, '))'),
+        seq('(', '(', optional($._expression), '))'),
       ),
     ),
 
@@ -661,7 +661,11 @@ module.exports = grammar({
 
     ansi_c_string: _ => /\$'([^']|\\')*'/,
 
-    number: _ => /-?(0x)?[0-9]+(#[0-9A-Za-z@_]+)?/,
+    number: $ => choice(
+      /-?(0x)?[0-9]+(#[0-9A-Za-z@_]+)?/,
+      // the base can be an expansion
+      seq(/-?(0x)?[0-9]+#/, $.expansion),
+    ),
 
     simple_expansion: $ => seq(
       '$',