Auto merge of #51258 - Mark-Simulacrum:stable-next, r=nikomatsakis 1.26.2

1.26.2 release

This includes a backport of #51235 which fixes #51117 on stable. It has not been tested.

r? @nikomatsakis since the backport was not clean.
cc @rust-lang/core @rust-lang/release

2 files changed, 39 insertions, 0 deletions

diff --git a/src/test/ui/borrowck/issue-51117.rs b/src/test/ui/borrowck/issue-51117.rs
new file mode 100644
index 00000000000..0a1e672b577
--- /dev/null
+++ b/src/test/ui/borrowck/issue-51117.rs
@@ -0,0 +1,25 @@
+// Copyright 2014 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.
+
+// Regression test for #51117 in borrowck interaction with match
+// default bindings. The borrow of `*bar` created by `baz` was failing
+// to register as a conflict with `bar.take()`.
+
+fn main() {
+    let mut foo = Some("foo".to_string());
+    let bar = &mut foo;
+    match bar {
+        Some(baz) => {
+            bar.take(); //~ ERROR cannot borrow
+            drop(baz);
+        },
+        None => unreachable!(),
+    }
+}
diff --git a/src/test/ui/borrowck/issue-51117.stderr b/src/test/ui/borrowck/issue-51117.stderr
new file mode 100644
index 00000000000..cb434f9b322
--- /dev/null
+++ b/src/test/ui/borrowck/issue-51117.stderr
@@ -0,0 +1,14 @@
+error[E0499]: cannot borrow `*bar` as mutable more than once at a time
+  --> $DIR/issue-51117.rs:20:13
+   |
+LL |         Some(baz) => {
+   |              --- first mutable borrow occurs here
+LL |             bar.take(); //~ ERROR cannot borrow
+   |             ^^^ second mutable borrow occurs here
+...
+LL |     }
+   |     - first borrow ends here
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0499`.