Function spawn_unchecked 

pub(super) unsafe fn spawn_unchecked<'scope, F, T>(
    name: Option<String>,
    stack_size: Option<usize>,
    no_hooks: bool,
    scope_data: Option<Arc<ScopeData>>,
    f: F,
) -> Result<JoinInner<'scope, T>>
where
    F: FnOnce() -> T + Send,
    T: Send,