From 651a2650eb7d7471e0903b210a97ed1b15b6fe77 Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Thu, 20 Apr 2023 14:08:21 +0100
Subject: Fix bug that would crash if given an empty subex

---
 subex/parse.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/subex/parse.go b/subex/parse.go
index 1e5e36e..24ff3d1 100644
--- a/subex/parse.go
+++ b/subex/parse.go
@@ -356,5 +356,9 @@ func parseSubex(l RuneReader, minPower int) SubexAST {
 }
 
 func Parse(l RuneReader) SubexAST {
-	return parseSubex(l, 0)
+	ast := parseSubex(l, 0)
+	if ast == nil {
+		return SubexASTEmpty{}
+	}
+	return ast
 }
-- 
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