From 3dbaf3a4ca3437489a8c08c1d459eb20d5f7466c Mon Sep 17 00:00:00 2001
From: Yip Coekjan <69834864+Coekjan@users.noreply.github.com>
Date: Mon, 12 Aug 2024 16:16:56 +0800
Subject: [PATCH] Check cyclic-import when importing package (#4737)

---
 crates/typst/src/eval/import.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/crates/typst/src/eval/import.rs b/crates/typst/src/eval/import.rs
index 68187a966..d02938cc1 100644
--- a/crates/typst/src/eval/import.rs
+++ b/crates/typst/src/eval/import.rs
@@ -182,6 +182,12 @@ fn import_package(vm: &mut Vm, spec: PackageSpec, span: Span) -> SourceResult<Mo
     // Evaluate the entry point.
     let entrypoint_id = manifest_id.join(&manifest.package.entrypoint);
     let source = vm.world().source(entrypoint_id).at(span)?;
+
+    // Prevent cyclic importing.
+    if vm.engine.route.contains(source.id()) {
+        bail!(span, "cyclic import");
+    }
+
     let point = || Tracepoint::Import;
     Ok(eval(
         vm.world(),