From a73d5f1e50ee9facb776e4a9ad4019a32092be0a Mon Sep 17 00:00:00 2001
From: Antoni Boucher <bouanto@zoho.com>
Date: Thu, 17 Sep 2026 15:00:53 -0400
Subject: [PATCH] Add regression test for recursive type bug found a while ago
 when compiling Rust for Linux

---
 tests/compile/recursive_types.rs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 tests/compile/recursive_types.rs

diff --git a/tests/compile/recursive_types.rs b/tests/compile/recursive_types.rs
new file mode 100644
index 00000000000..3c69074887f
--- /dev/null
+++ b/tests/compile/recursive_types.rs
@@ -0,0 +1,22 @@
+// Compiler:
+
+// `Set` reaches itself by value through `*mut Root`, so a backend that emits `Root`'s
+// fields with the still-incomplete `Set` type fails to compile this.
+
+#![crate_type = "lib"]
+
+#[repr(C)]
+pub struct Set {
+    pub root: *mut Root,
+    pub first: usize,
+    pub second: usize,
+}
+
+#[repr(C)]
+pub struct Root {
+    pub default_set: Set,
+}
+
+pub fn identity(set: Set) -> Set {
+    set
+}