fix: Do not consider mutable usage of deref to *mut T as deref_mut

crates/hir-ty/src/infer/mutability.rs

@@ -180,6 +180,7 @@ impl InferenceContext<'_> {
                 self.infer_mut_expr(index, Mutability::Not);
             }
             Expr::UnaryOp { expr, op: UnaryOp::Deref } => {
+                let mut mutability = mutability;
                 if let Some((f, _)) = self.result.method_resolutions.get_mut(&tgt_expr) {
                     if mutability == Mutability::Mut {
                         if let Some(deref_trait) = self
@@ -187,7 +188,17 @@ impl InferenceContext<'_> {
                             .lang_item(self.table.trait_env.krate, LangItem::DerefMut)
                             .and_then(|l| l.as_trait())
                         {
-                            if let Some(deref_fn) = self
+                            let ty = self.result.type_of_expr.get(*expr);
+                            let is_mut_ptr = ty.is_some_and(|ty| {
+                                let ty = self.table.resolve_ty_shallow(ty);
+                                matches!(
+                                    ty.kind(Interner),
+                                    chalk_ir::TyKind::Raw(Mutability::Mut, _)
+                                )
+                            });
+                            if is_mut_ptr {
+                                mutability = Mutability::Not;
+                            } else if let Some(deref_fn) = self
                                 .db
                                 .trait_data(deref_trait)
                                 .method_by_name(&Name::new_symbol_root(sym::deref_mut.clone()))

crates/ide-diagnostics/src/handlers/mutability_errors.rs

@@ -1255,6 +1255,31 @@ pub unsafe fn foo(a: *mut A) {
       //^^^^^ 💡 warn: variable does not need to be mutable
     let _ = b();
 }
+"#,
+        );
+    }
+
+    #[test]
+    fn regression_15799() {
+        check_diagnostics(
+            r#"
+//- minicore: deref_mut
+struct WrapPtr(*mut u32);
+
+impl core::ops::Deref for WrapPtr {
+    type Target = *mut u32;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+fn main() {
+    let mut x = 0u32;
+    let wrap = WrapPtr(&mut x);
+    unsafe {
+        **wrap = 6;
+    }
+}
 "#,
         );
     }