From bc6514e336f6971a6d05c6ae987d60e24dbf6db0 Mon Sep 17 00:00:00 2001
From: Yuki Okushi <yuki.okushi@huawei.com>
Date: Fri, 2 Jul 2021 08:31:51 +0900
Subject: [PATCH] Add a regression test for issue-70703

---
 src/test/ui/inference/issue-70703.rs | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 src/test/ui/inference/issue-70703.rs

diff --git a/src/test/ui/inference/issue-70703.rs b/src/test/ui/inference/issue-70703.rs
new file mode 100644
index 00000000000..d90498e96ea
--- /dev/null
+++ b/src/test/ui/inference/issue-70703.rs
@@ -0,0 +1,26 @@
+// check-pass
+
+trait Factory {
+    type Product;
+}
+
+impl Factory for () {
+    type Product = ();
+}
+
+trait ProductConsumer<P> {
+    fn consume(self, product: P);
+}
+
+impl<P> ProductConsumer<P> for () {
+    fn consume(self, _: P) {}
+}
+
+fn make_product_consumer<F: Factory>(_: F) -> impl ProductConsumer<F::Product> {
+    ()
+}
+
+fn main() {
+    let consumer = make_product_consumer(());
+    consumer.consume(());
+}