1 files changed, 20 insertions, 0 deletions
diff --git a/tests/ui/borrowck/reassignment_immutable_fields.rs b/tests/ui/borrowck/reassignment_immutable_fields.rs
new file mode 100644
index 000000000..fd2ab62a4
--- /dev/null
+++ b/tests/ui/borrowck/reassignment_immutable_fields.rs
@@ -0,0 +1,20 @@
+// This test is currently disallowed, but we hope someday to support it.
+//
+// FIXME(#21232)
+
+fn assign_both_fields_and_use() {
+    let x: (u32, u32);
+    x.0 = 1; //~ ERROR
+    x.1 = 22;
+    drop(x.0);
+    drop(x.1);
+}
+
+fn assign_both_fields_the_use_var() {
+    let x: (u32, u32);
+    x.0 = 1; //~ ERROR
+    x.1 = 22;
+    drop(x);
+}
+
+fn main() { }