pub fn first_sync_value_from<T>(node: &Node<T>) -> Result<T, SyncValueFromError>where
T: Clone + 'static,Expand description
Read the first DATA value delivered during the synchronous subscribe window.
This is a host-boundary convenience for already-synchronous sources such as
of and from_iter. It does not wait, spawn, poll, or install a hidden
scheduler: if the node remains live without a DATA value, it returns
SyncValueFromError::Pending after immediately unsubscribing.