1 files changed, 48 insertions, 0 deletions
diff --git a/src/test/ui/proc-macro/auxiliary/weird-hygiene.rs b/src/test/ui/proc-macro/auxiliary/weird-hygiene.rs
new file mode 100644
index 000000000..338e436df
--- /dev/null
+++ b/src/test/ui/proc-macro/auxiliary/weird-hygiene.rs
@@ -0,0 +1,48 @@
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+
+use proc_macro::{TokenStream, TokenTree, Group};
+
+fn find_my_ident(tokens: TokenStream) -> Option<TokenStream> {
+    for token in tokens {
+        if let TokenTree::Ident(ident) = &token {
+            if ident.to_string() == "hidden_ident" {
+                return Some(vec![token].into_iter().collect())
+            }
+        } else if let TokenTree::Group(g) = token {
+            if let Some(stream) = find_my_ident(g.stream()) {
+                return Some(stream)
+            }
+        }
+    }
+    return None;
+}
+
+
+#[proc_macro_derive(WeirdDerive)]
+pub fn weird_derive(item: TokenStream) -> TokenStream {
+    let my_ident = find_my_ident(item).expect("Missing 'my_ident'!");
+    let tokens: TokenStream = "call_it!();".parse().unwrap();
+    let final_call = tokens.into_iter().map(|tree| {
+        if let TokenTree::Group(g) = tree {
+            return Group::new(g.delimiter(), my_ident.clone()).into()
+        } else {
+            return tree
+        }
+    }).collect();
+    final_call
+}
+
+#[proc_macro]
+pub fn recollect(item: TokenStream) -> TokenStream {
+    item.into_iter().collect()
+}
+
+#[proc_macro_attribute]
+pub fn recollect_attr(_attr: TokenStream, mut item: TokenStream) -> TokenStream {
+    item.into_iter().collect()
+}