--- /dev/null
+error[E0506]: cannot assign to `c.container_field` because it is borrowed
+ --> $DIR/issue-81365-7.rs:20:5
+ |
+LL | let first = &c.target_field;
+ | - borrow of `c.container_field` occurs here
+LL | c.container_field = true;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^ assignment to borrowed `c.container_field` occurs here
+LL | first;
+ | ----- borrow later used here
+ |
+ = note: borrow occurs due to deref coercion to `DerefTarget`
+note: deref defined here
+ --> $DIR/issue-81365-7.rs:12:5
+ |
+LL | type Target = DerefTarget;
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0506`.