1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/linking/cdylib-no-mangle.rs b/tests/ui/linking/cdylib-no-mangle.rs
new file mode 100644
index 00000000000..f442c3f584d
--- /dev/null
+++ b/tests/ui/linking/cdylib-no-mangle.rs
@@ -0,0 +1,20 @@
+//@ only-apple
+//@ build-fail
+//@ dont-check-compiler-stderr
+//@ dont-check-compiler-stdout
+
+// Regression test for <https://github.com/rust-lang/rust/issues/139744>.
+// Functions in the dynamic library marked with no_mangle should not be GC-ed.
+
+#![crate_type = "cdylib"]
+
+unsafe extern "C" {
+    unsafe static THIS_SYMBOL_SHOULD_BE_UNDEFINED: usize;
+}
+
+#[unsafe(no_mangle)]
+pub unsafe fn function_marked_with_no_mangle() {
+    println!("FUNCTION_MARKED_WITH_NO_MANGLE = {}", unsafe { THIS_SYMBOL_SHOULD_BE_UNDEFINED });
+}
+
+//~? ERROR linking