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hi all, I have a resouce which used to be a c# void where resource were created, and now it's refactored to a "proper" pulumi class - inheriting from pulumi "stack". When I do pulumi preview now, I get
```error: Duplicate resource URN 'urn:pulumi:&lt;stuff&gt;::pulumi:pulumi:Stack::&lt;stuff&gt;'; try giving it a unique name```
anyone know if there's a way around this? The entire stack is the same, its just that it's being instantiated slightly differently

its even showing me that things are the same:
```pulumi preview -j --show-sames
{
    "steps": [
        {
            "op": "same",
            "urn": "urn:pulumi:prod::&lt;stuff&gt;::pulumi:pulumi:Stack::&lt;stuff&gt;",
            "oldState": {
                "urn": "urn:pulumi:prod::&lt;stuff&gt;::pulumi:pulumi:Stack::&lt;stuff&gt;",
                "custom": false,
                "type": "pulumi:pulumi:Stack",
                "created": "0001-01-01T00:00:00Z",
                "modified": "0001-01-01T00:00:00Z"
            },
            "newState": {
                "urn": "urn:pulumi:prod::&lt;stuff&gt;::pulumi:pulumi:Stack::&lt;stuff&gt;",
                "custom": false,
                "type": "pulumi:pulumi:Stack",
                "created": "0001-01-01T00:00:00Z",
                "modified": "0001-01-01T00:00:00Z"
            },
            "detailedDiff": null
        }
    ],
    "diagnostics": [
        {
            "urn": "urn:pulumi:prod::&lt;stuff&gt;::pulumi:pulumi:Stack::&lt;stuff&gt;",
            "message": "error: Duplicate resource URN 'urn:pulumi:prod::&lt;stuff&gt;::pulumi:pulumi:Stack::&lt;stuff&gt;'; try giving it a unique name\n",
            "severity": "error"
        }
    ],
    "duration": 643302009,
    "changeSummary": {
        "same": 1
    }
}```

(my problem is that i'm trying to provide stack output, and for that to work I have to inherit from `Stack`, which I didn't do from the start. Now the stack has a lot of resources, and I'd very reluctant to tear everything down.

I cannot think of a reason to extend the Stack class. You can provide stack outputs by adding them to the existing stack object, you don't need to create a new one. And you don't need to create a new Stack class.

no I'm not extending stack, but inherit from it. If I don't, no outputs are provided. (this is c#)

at least that's what the docs say I should do:
```public class MyStack : Stack
{
    public MyStack()
    {
        ...
        this.Url = resource.Url;
    }

    // 'url' is the output name. By default, it would take the property name 'Url'.
    [Output("url")] Output&lt;string&gt; Url { get; set; }
}```
I'd love it if there was a python-style "stack.export" somewhere in the c# sdk too

This seems to be a very specific question then. Maybe <#CQ2QFLNFL|> would be a good place to find the relevant expertise?