Instruction file imported from miramocha/griddungeon-design-docs (.cursor/rules/unity-csharp-unityengine-object.mdc). Copyright stays with the author.

Qualify UnityEngine.Object explicitly in C#

UnityEngine.Object and System.Object (object) share the short name Object. Using bare Object in any Unity C# file causes CS0104 ambiguous reference.

Always write fully-qualified

// ❌ BAD — CS0104 ambiguous reference
where TPresenter : Object, IMyInterface
UnityEngine.Object found = Object.FindAnyObjectByType<T>();

// ✅ GOOD
where TPresenter : UnityEngine.Object, IMyInterface
UnityEngine.Object found = UnityEngine.Object.FindAnyObjectByType<T>();

Applies to

• Generic type constraints: where T : UnityEngine.Object
• Static calls: UnityEngine.Object.FindAnyObjectByType, Instantiate, Destroy, etc.
• Any variable/field typed as the base Object class

Using directives don't help

Adding using UnityEngine; does not resolve the ambiguity — both UnityEngine.Object and System.Object are still in scope. Only fully-qualified names are unambiguous.