1 files changed, 40 insertions, 0 deletions
diff --git a/tests/ui/generator/yield-while-ref-reborrowed.rs b/tests/ui/generator/yield-while-ref-reborrowed.rs
new file mode 100644
index 00000000000..a03ef945dd2
--- /dev/null
+++ b/tests/ui/generator/yield-while-ref-reborrowed.rs
@@ -0,0 +1,40 @@
+#![feature(generators, generator_trait)]
+
+use std::ops::{GeneratorState, Generator};
+use std::cell::Cell;
+use std::pin::Pin;
+
+fn reborrow_shared_ref(x: &i32) {
+    // This is OK -- we have a borrow live over the yield, but it's of
+    // data that outlives the generator.
+    let mut b = move || {
+        let a = &*x;
+        yield();
+        println!("{}", a);
+    };
+    Pin::new(&mut b).resume(());
+}
+
+fn reborrow_mutable_ref(x: &mut i32) {
+    // This is OK -- we have a borrow live over the yield, but it's of
+    // data that outlives the generator.
+    let mut b = move || {
+        let a = &mut *x;
+        yield();
+        println!("{}", a);
+    };
+    Pin::new(&mut b).resume(());
+}
+
+fn reborrow_mutable_ref_2(x: &mut i32) {
+    // ...but not OK to go on using `x`.
+    let mut b = || {
+        let a = &mut *x;
+        yield();
+        println!("{}", a);
+    };
+    println!("{}", x); //~ ERROR
+    Pin::new(&mut b).resume(());
+}
+
+fn main() { }