rust/tests/ui/pattern/issue-52240.stderr
Esteban Küber 71b0755a98 Provide more context when mutably borrowing an imutable borrow
Point at statics and consts being mutable borrowed or written to:

```
error[E0594]: cannot assign to immutable static item `NUM`
  --> $DIR/E0594.rs:4:5
   |
LL | static NUM: i32 = 18;
   | --------------- this `static` cannot be written to
...
LL |     NUM = 20;
   |     ^^^^^^^^ cannot assign
```

Point at the expression that couldn't be mutably borrowed from a pattern:

```
error[E0596]: cannot borrow data in a `&` reference as mutable
  --> $DIR/mut-pattern-of-immutable-borrow.rs:19:14
   |
LL |     match &arg.field {
   |           ---------- this cannot be borrowed as mutable
LL |         Some(ref mut s) => s.push('a'),
   |              ^^^^^^^^^ cannot borrow as mutable
```
2025-11-09 22:14:48 +00:00

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Text

error[E0596]: cannot borrow data in a `&` reference as mutable
--> $DIR/issue-52240.rs:9:27
|
LL | if let (Some(Foo::Bar(ref mut val)), _) = (&arr.get(0), 0) {
| ^^^^^^^^^^^ ---------------- this cannot be borrowed as mutable
| |
| cannot borrow as mutable
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0596`.