1 files changed, 47 insertions, 0 deletions
diff --git a/tests/ui/parser/fn-header-syntactic-pass.rs b/tests/ui/parser/fn-header-syntactic-pass.rs
new file mode 100644
index 00000000000..68f1f7901bb
--- /dev/null
+++ b/tests/ui/parser/fn-header-syntactic-pass.rs
@@ -0,0 +1,47 @@
+// Ensures that all `fn` forms can have all the function qualifiers syntactically.
+
+// check-pass
+// edition:2018
+
+fn main() {}
+
+#[cfg(FALSE)]
+fn syntax() {
+    async fn f();
+    unsafe fn f();
+    const fn f();
+    extern "C" fn f();
+    const async unsafe extern "C" fn f();
+
+    trait X {
+        async fn f();
+        unsafe fn f();
+        const fn f();
+        extern "C" fn f();
+        const async unsafe extern "C" fn f();
+    }
+
+    impl X for Y {
+        async fn f();
+        unsafe fn f();
+        const fn f();
+        extern "C" fn f();
+        const async unsafe extern "C" fn f();
+    }
+
+    impl Y {
+        async fn f();
+        unsafe fn f();
+        const fn f();
+        extern "C" fn f();
+        const async unsafe extern "C" fn f();
+    }
+
+    extern "C" {
+        fn f();
+        fn f();
+        fn f();
+        fn f();
+        fn f();
+    }
+}