1 files changed, 14 insertions, 0 deletions
diff --git a/src/test/ui/nll/generator-upvar-mutability.rs b/src/test/ui/nll/generator-upvar-mutability.rs
new file mode 100644
index 000000000..c49ea15b8
--- /dev/null
+++ b/src/test/ui/nll/generator-upvar-mutability.rs
@@ -0,0 +1,14 @@
+// Check that generators respect the muatability of their upvars.
+
+#![feature(generators)]
+
+fn mutate_upvar() {
+    let x = 0;
+    move || {
+        x = 1;
+        //~^ ERROR
+        yield;
+    };
+}
+
+fn main() {}