# XO0802: scope handle, or a value containing a task group, escapes its scope

No task outlives its scope. A scope handle, a closure that captures one, or a value whose type contains a `task.Group` from `s.group()` cannot be the scope's value, be returned, or be stored outside the scope (in an outer `var`, a collection, or a channel), because it could start tasks after the scope ended. `os.tasks`, the program lifetime group from `main`, may be stored anywhere. See core 7.1.

## Example

```xo
fn f() -> Int {
  let h = scope s { s }
  1
}
```

## Fix

```xo
fn f() -> Int {
  scope s {
    let t = s.spawn(fn() { 1 })
    t.await
  }
}
```

Run `xo explain XO0802` for this text in a terminal, or see
[section 10.6 of the specification](../../spec/core/#106-diagnostic-codes).