Rollup merge of #39602 - estebank:fix-39544, r=eddyb

Fix ICE when accessing mutably an immutable enum

Fix #39544.

2 files changed, 30 insertions, 0 deletions

diff --git a/src/test/ui/did_you_mean/issue-39544.rs b/src/test/ui/did_you_mean/issue-39544.rs
new file mode 100644
index 00000000000..bcdafefa247
--- /dev/null
+++ b/src/test/ui/did_you_mean/issue-39544.rs
@@ -0,0 +1,22 @@
+// Copyright 2017 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.
+
+enum X {
+    Y
+}
+
+struct Z {
+    x: X
+}
+
+fn main() {
+    let z = Z { x: X::Y };
+    let _ = &mut z.x;
+}
diff --git a/src/test/ui/did_you_mean/issue-39544.stderr b/src/test/ui/did_you_mean/issue-39544.stderr
new file mode 100644
index 00000000000..c0088f39ad3
--- /dev/null
+++ b/src/test/ui/did_you_mean/issue-39544.stderr
@@ -0,0 +1,8 @@
+error: cannot borrow immutable field `z.x` as mutable
+  --> $DIR/issue-39544.rs:21:18
+   |
+21 |     let _ = &mut z.x;
+   |                  ^^^
+
+error: aborting due to previous error
+