1 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/borrowck/reassignment_immutable_fields_twice.rs b/tests/ui/borrowck/reassignment_immutable_fields_twice.rs
new file mode 100644
index 000000000..2775a54c8
--- /dev/null
+++ b/tests/ui/borrowck/reassignment_immutable_fields_twice.rs
@@ -0,0 +1,17 @@
+// This should never be allowed -- since `x` is not `mut`, so `x.0`
+// cannot be assigned twice.
+
+fn var_then_field() {
+    let x: (u32, u32);
+    x = (22, 44);
+    x.0 = 1; //~ ERROR
+}
+
+fn same_field_twice() {
+    let x: (u32, u32);
+    x.0 = 1; //~ ERROR
+    x.0 = 22;
+    x.1 = 44;
+}
+
+fn main() { }