1 files changed, 13 insertions, 0 deletions
diff --git a/src/test/ui/proc-macro/signature.rs b/src/test/ui/proc-macro/signature.rs
new file mode 100644
index 000000000..230223825
--- /dev/null
+++ b/src/test/ui/proc-macro/signature.rs
@@ -0,0 +1,13 @@
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+#![allow(warnings)]
+
+extern crate proc_macro;
+
+#[proc_macro_derive(A)]
+pub unsafe extern "C" fn foo(a: i32, b: u32) -> u32 {
+    //~^ ERROR: expected a `Fn<(proc_macro::TokenStream,)>` closure, found `unsafe extern "C" fn
+    loop {}
+}