Auto merge of #27011 - dotdash:issue-26996, r=luqmana

If we match a whole struct or tuple, the "field" for the reassignment
checker will be "None" which means that mutating any field should count
as a reassignment.

Fixes #26996.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/test/run-pass/issue-26996.rs b/src/test/run-pass/issue-26996.rs
new file mode 100644
index 00000000000..e17845a68bc
--- /dev/null
+++ b/src/test/run-pass/issue-26996.rs
@@ -0,0 +1,19 @@
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn main() {
+    let mut c = (1, "".to_owned());
+    match c {
+        c2 => {
+            c.0 = 2;
+            assert_eq!(c2.0, 1);
+        }
+    }
+}