From b779f45fedef4b02bd0daebba34b39d5d367181c Mon Sep 17 00:00:00 2001
From: Mazdak Farrokhzad <twingoow@gmail.com>
Date: Mon, 29 Jul 2019 04:07:33 +0200
Subject: [PATCH] Add test for #53678.

---
 .../issue-53678-generator-and-const-fn.rs     | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 src/test/ui/existential_types/issue-53678-generator-and-const-fn.rs

diff --git a/src/test/ui/existential_types/issue-53678-generator-and-const-fn.rs b/src/test/ui/existential_types/issue-53678-generator-and-const-fn.rs
new file mode 100644
index 000000000000..d964f2b74ff6
--- /dev/null
+++ b/src/test/ui/existential_types/issue-53678-generator-and-const-fn.rs
@@ -0,0 +1,19 @@
+// check-pass
+
+#![feature(const_fn, generators, generator_trait, existential_type)]
+
+use std::ops::Generator;
+
+existential type GenOnce<Y, R>: Generator<Yield = Y, Return = R>;
+
+const fn const_generator<Y, R>(yielding: Y, returning: R) -> GenOnce<Y, R> {
+    move || {
+        yield yielding;
+
+        return returning;
+    }
+}
+
+const FOO: GenOnce<usize, usize> = const_generator(10, 100);
+
+fn main() {}