1 files changed, 12 insertions, 0 deletions
diff --git a/tests/ui/diagnostic_namespace/auxiliary/proc-macro-helper.rs b/tests/ui/diagnostic_namespace/auxiliary/proc-macro-helper.rs
new file mode 100644
index 000000000..759c32c84
--- /dev/null
+++ b/tests/ui/diagnostic_namespace/auxiliary/proc-macro-helper.rs
@@ -0,0 +1,12 @@
+// force-host
+// no-prefer-dynamic
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+
+use proc_macro::TokenStream;
+
+#[proc_macro_attribute]
+pub fn diagnostic(i: TokenStream, _: TokenStream) -> TokenStream {
+    i
+}