Auto merge of #9684 - kraktus:ref_option_ref, r=xFrednet

`ref_option_ref` do not lint when inner reference is mutable

changelog: FP: [`ref_option_ref`]: No longer lints if the inner reference is mutable

fix #9682

Author: bors

Diff for: clippy_lints/src/ref_option_ref.rs

@@ -52,7 +52,8 @@ impl<'tcx> LateLintPass<'tcx> for RefOptionRef {
                 GenericArg::Type(inner_ty) => Some(inner_ty),
                 _ => None,
             });
-            if let TyKind::Rptr(_, _) = inner_ty.kind;
+            if let TyKind::Rptr(_, ref inner_mut_ty) = inner_ty.kind;
+            if inner_mut_ty.mutbl == Mutability::Not;
 
             then {
                 span_lint_and_sugg(

Diff for: tests/ui/ref_option_ref.rs

@@ -45,3 +45,8 @@ impl RefOptTrait for u32 {
 fn main() {
     let x: &Option<&u32> = &None;
 }
+
+fn issue9682(arg: &Option<&mut String>) {
+    // Should not lint, as the inner ref is mutable making it non `Copy`
+    println!("{arg:?}");
+}