Relocate issues/issue-51515.rs to

borrowck/assignment-to-immutable-ref.rs

Author: reddevilmidzy

tests/ui/issues/issue-51515.rs renamed to tests/ui/borrowck/assignment-to-immutable-ref.rs

@@ -1,3 +1,6 @@
+//! Regression test for issue <https://github.com/rust-lang/rust/issues/51515>
+//! Test that assigning through an immutable reference (`&`) correctly yields an assignment error (E0594) and suggests using a mutable reference.
+
 fn main() {
     let foo = &16;
     //~^ HELP consider changing this to be a mutable reference

tests/ui/issues/issue-51515.stderr renamed to tests/ui/borrowck/assignment-to-immutable-ref.stderr

@@ -1,5 +1,5 @@
 error[E0594]: cannot assign to `*foo`, which is behind a `&` reference
-  --> $DIR/issue-51515.rs:4:5
+  --> $DIR/assignment-to-immutable-ref.rs:7:5
    |
 LL |     *foo = 32;
    |     ^^^^^^^^^ `foo` is a `&` reference, so it cannot be written to
@@ -10,7 +10,7 @@ LL |     let foo = &mut 16;
    |                +++
 
 error[E0594]: cannot assign to `*bar`, which is behind a `&` reference
-  --> $DIR/issue-51515.rs:8:5
+  --> $DIR/assignment-to-immutable-ref.rs:11:5
    |
 LL |     *bar = 64;
    |     ^^^^^^^^^ `bar` is a `&` reference, so it cannot be written to