1 files changed, 14 insertions, 0 deletions
diff --git a/src/test/ui/underscore-imports/auxiliary/duplicate.rs b/src/test/ui/underscore-imports/auxiliary/duplicate.rs
new file mode 100644
index 000000000..92d741b6a
--- /dev/null
+++ b/src/test/ui/underscore-imports/auxiliary/duplicate.rs
@@ -0,0 +1,14 @@
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+
+use proc_macro::*;
+
+#[proc_macro_attribute]
+pub fn duplicate(_: TokenStream, input: TokenStream) -> TokenStream {
+    let clone = input.clone();
+    input.into_iter().chain(clone.into_iter()).collect()
+}