diff --git a/tests/source/extern.rs b/tests/source/extern.rs
index 564c078ed2cd..2ef81f6fd1c5 100644
--- a/tests/source/extern.rs
+++ b/tests/source/extern.rs
@@ -58,6 +58,25 @@ libc::c_long;
                                , mode3: *const c_char,
                                file: *mut FILE)
                               -> *mut FILE;
+
+
+       async fn foo(
+
+       ) -> *mut
+       Bar;
+       const fn foo(
+
+       ) ->
+                            *mut Bar;
+       unsafe fn foo(
+
+       ) -> *
+       mut
+       Bar;
+
+       pub async fn foo() -> *mut Bar;
+       pub(super) const fn foo() -> *mut Bar;
+       pub(crate) unsafe fn foo() -> *mut Bar;
    }
 
 extern {
diff --git a/tests/target/extern.rs b/tests/target/extern.rs
index d25dba7d1bb9..29751573d38b 100644
--- a/tests/target/extern.rs
+++ b/tests/target/extern.rs
@@ -73,6 +73,14 @@ extern "C" {
         mode3: *const c_char,
         file: *mut FILE,
     ) -> *mut FILE;
+
+    async fn foo() -> *mut Bar;
+    const fn foo() -> *mut Bar;
+    unsafe fn foo() -> *mut Bar;
+
+    pub async fn foo() -> *mut Bar;
+    pub(super) const fn foo() -> *mut Bar;
+    pub(crate) unsafe fn foo() -> *mut Bar;
 }
 
 extern "C" {}