1 files changed, 25 insertions, 0 deletions
diff --git a/tests/ui/generator/retain-resume-ref.rs b/tests/ui/generator/retain-resume-ref.rs
new file mode 100644
index 000000000..0606ea71c
--- /dev/null
+++ b/tests/ui/generator/retain-resume-ref.rs
@@ -0,0 +1,25 @@
+//! This test ensures that a mutable reference cannot be passed as a resume argument twice.
+
+#![feature(generators, generator_trait)]
+
+use std::marker::Unpin;
+use std::ops::{
+    Generator,
+    GeneratorState::{self, *},
+};
+use std::pin::Pin;
+
+fn main() {
+    let mut thing = String::from("hello");
+
+    let mut gen = |r| {
+        if false {
+            yield r;
+        }
+    };
+
+    let mut gen = Pin::new(&mut gen);
+    gen.as_mut().resume(&mut thing);
+    gen.as_mut().resume(&mut thing);
+    //~^ cannot borrow `thing` as mutable more than once at a time
+}