1 files changed, 14 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrow-immutable-upvar-mutation-impl-trait.stderr b/tests/ui/borrowck/borrow-immutable-upvar-mutation-impl-trait.stderr
new file mode 100644
index 000000000..6235e0db0
--- /dev/null
+++ b/tests/ui/borrowck/borrow-immutable-upvar-mutation-impl-trait.stderr
@@ -0,0 +1,14 @@
+error[E0594]: cannot assign to `x`, as it is a captured variable in a `Fn` closure
+  --> $DIR/borrow-immutable-upvar-mutation-impl-trait.rs:11:9
+   |
+LL | fn bar() -> impl Fn() -> usize {
+   |    ---      ------------------ change this to return `FnMut` instead of `Fn`
+LL |     let mut x = 0;
+LL |     move || {
+   |     ------- in this closure
+LL |         x += 1;
+   |         ^^^^^^ cannot assign
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0594`.