Suggest to deref/reborrow to turn scrutinee into the right type for pattern

Code

use std::cell::RefCell;

struct Foo {
    content: RefCell::<Option<u64>>,
}

fn main() {
    let foo = Foo {
        content: RefCell::new(Some(5)),
    };

    if let Some(_content) = foo.content.borrow_mut() {
    };
}

Current output

error[E0308]: mismatched types
  --> src/main.rs:12:12
   |
12 |     if let Some(_content) = foo.content.borrow_mut() {
   |            ^^^^^^^^^^^^^^   ------------------------ this expression has type `RefMut<'_, Option<u64>>`
   |            |
   |            expected `RefMut<'_, Option<u64>>`, found `Option<_>`
   |
   = note: expected struct `RefMut<'_, Option<u64>, >`
                found enum `Option<_>`

For more information about this error, try `rustc --explain E0308`.
error: could not compile `check_ice` (bin "check_ice") due to 1 previous error

Desired output

It can suggest to deref the RefMut:

if let Some(_content) = *foo.content.borrow_mut()

Rationale and extra context

No response

Other cases

No response

Rust Version

rustc 1.83.0-nightly (7042c269c 2024-09-23)
binary: rustc
commit-hash: 7042c269c166191cd5d8daf0409890903df7af57
commit-date: 2024-09-23
host: x86_64-unknown-linux-gnu
release: 1.83.0-nightly
LLVM version: 19.1.0

Anything else?

No response

Start by reproducing the diagnostic from the example in src/main.rs with the reported rustc version and inspect the E0308 diagnostic path. Add a dereference or reborrow suggestion for this RefMut/Option pattern mismatch, then verify that the output includes the suggested *foo.content.borrow_mut() form.