From 8b089f4935d041eb7dc7eead8a303965f87188fb Mon Sep 17 00:00:00 2001
From: chrchr-github <78114321+chrchr-github@users.noreply.github.com>
Date: Wed, 1 Jul 2026 09:42:32 +0200
Subject: [PATCH 1/2] Update tokenize.cpp

---
 lib/tokenize.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index b29e807b8b5..61719f5291d 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -3470,6 +3470,8 @@ bool Tokenizer::simplifyUsing()
                 skip = true;
                 simplifyUsingError(usingStart, usingEnd);
             }
+            if (!after)
+                syntaxError(tok1);
             tok1 = after->previous();
         }
 

From 974a03a37953353fbbf7112c1aec39fa63315df7 Mon Sep 17 00:00:00 2001
From: chrchr-github <78114321+chrchr-github@users.noreply.github.com>
Date: Wed, 1 Jul 2026 09:43:54 +0200
Subject: [PATCH 2/2] Create crash-42dad53b40278386e4ebd224813e26541cc725f1

---
 .../fuzz-crash/crash-42dad53b40278386e4ebd224813e26541cc725f1    | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 test/cli/fuzz-crash/crash-42dad53b40278386e4ebd224813e26541cc725f1

diff --git a/test/cli/fuzz-crash/crash-42dad53b40278386e4ebd224813e26541cc725f1 b/test/cli/fuzz-crash/crash-42dad53b40278386e4ebd224813e26541cc725f1
new file mode 100644
index 00000000000..3a9abbf229f
--- /dev/null
+++ b/test/cli/fuzz-crash/crash-42dad53b40278386e4ebd224813e26541cc725f1
@@ -0,0 +1 @@
+using C=C*;C{{}}