1 files changed, 26 insertions, 0 deletions
diff --git a/tests/ui/proc-macro/allowed-signatures.rs b/tests/ui/proc-macro/allowed-signatures.rs
new file mode 100644
index 000000000..868508761
--- /dev/null
+++ b/tests/ui/proc-macro/allowed-signatures.rs
@@ -0,0 +1,26 @@
+// check-pass
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+#![allow(private_in_public)]
+extern crate proc_macro;
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn foo<T>(t: T) -> TokenStream {
+  TokenStream::new()
+}
+
+trait Project {
+    type Assoc;
+}
+
+impl Project for () {
+    type Assoc = TokenStream;
+}
+
+#[proc_macro]
+pub fn uwu(_input: <() as Project>::Assoc) -> <() as Project>::Assoc {
+    TokenStream::new()
+}