1 files changed, 21 insertions, 0 deletions
diff --git a/src/test/ui/borrowck/issue-52967-edition-2018-needs-two-phase-borrows.rs b/src/test/ui/borrowck/issue-52967-edition-2018-needs-two-phase-borrows.rs
new file mode 100644
index 000000000..fc8a07554
--- /dev/null
+++ b/src/test/ui/borrowck/issue-52967-edition-2018-needs-two-phase-borrows.rs
@@ -0,0 +1,21 @@
+// This is a regression test for #52967, where we discovered that in
+// the initial deployment of NLL for the 2018 edition, I forgot to
+// turn on two-phase-borrows in addition to `-Z borrowck=migrate`.
+
+// revisions: edition2015 edition2018
+//[edition2018]edition:2018
+
+// run-pass
+
+fn the_bug() {
+    let mut stuff = ("left", "right");
+    match stuff {
+        (ref mut left, _) if *left == "left" => { *left = "new left"; }
+        _ => {}
+    }
+    assert_eq!(stuff, ("new left", "right"));
+}
+
+fn main() {
+    the_bug();
+}