From 075b5b288a9815e313154291f7289c70ac63ba52 Mon Sep 17 00:00:00 2001
From: cyqsimon <28627918+cyqsimon@users.noreply.github.com>
Date: Sat, 4 Nov 2023 20:23:33 +0800
Subject: [PATCH] Matcher parser errors when empty

---
 build/syntax_mapping.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/build/syntax_mapping.rs b/build/syntax_mapping.rs
index 73d2c04e..b8595e87 100644
--- a/build/syntax_mapping.rs
+++ b/build/syntax_mapping.rs
@@ -86,6 +86,10 @@ impl FromStr for Matcher {
             })
             .collect_vec();
 
+        if non_empty_segments.is_empty() {
+            bail!(r#"Parsed an empty matcher: "{s}""#);
+        }
+
         if non_empty_segments.iter().any(|seg| match seg {
             Seg::Text(t) => t.contains(['$', '{', '}']),
             Seg::Env(_) => false,