1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/ui/proc-macro/auxiliary/attribute-spans-preserved.rs b/src/test/ui/proc-macro/auxiliary/attribute-spans-preserved.rs
new file mode 100644
index 000000000..4d3279584
--- /dev/null
+++ b/src/test/ui/proc-macro/auxiliary/attribute-spans-preserved.rs
@@ -0,0 +1,35 @@
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+
+use proc_macro::*;
+
+#[proc_macro_attribute]
+pub fn foo(attr: TokenStream, f: TokenStream) -> TokenStream {
+    let mut tokens = f.into_iter();
+    assert_eq!(tokens.next().unwrap().to_string(), "#");
+    let next_attr = match tokens.next().unwrap() {
+        TokenTree::Group(g) => g,
+        _ => panic!(),
+    };
+
+    let fn_tok = tokens.next().unwrap();
+    let ident_tok = tokens.next().unwrap();
+    let args_tok = tokens.next().unwrap();
+    let body = tokens.next().unwrap();
+
+    let new_body = attr.into_iter()
+        .chain(next_attr.stream().into_iter().skip(1));
+
+    let tokens = vec![
+        fn_tok,
+        ident_tok,
+        args_tok,
+        Group::new(Delimiter::Brace, new_body.collect()).into(),
+    ].into_iter().collect::<TokenStream>();
+    println!("{}", tokens);
+    return tokens
+}