> For the complete documentation index, see [llms.txt](https://max-daunarovich.gitbook.io/flow-network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://max-daunarovich.gitbook.io/flow-network/introduction/composite-types/resources/resources-in-closures.md).

# Resources in Closures

Resources can not be captured in closures, as that could potentially result in duplications.

```
resource R {}

// Invalid: Declare a function which returns a closure which refers to
// the resource parameter `resource`. Each call to the returned function
// would return the resource, which should not be possible.
//
fun makeCloner(resource: @R): ((): @R) {
    return fun (): @R {
        return <-resource
    }
}

let test = makeCloner(resource: <-create R())
```