pub fn spawn<F, T>(f: F) -> JoinHandle<T>
where
    F: FnOnce() -> T,
    F: Send + 'static,
    T: Send + 'static,
{
    Builder::new().spawn(f).expect("failed to spawn thread")
}
/// Spawns a new thread, returning a JoinHandle for it.
Spawns a new thread, returning a JoinHandle for it.
Spawns a new thread returning a JoinHandle for it .
pub fn spawn<F, T>(f: F) -> JoinHandle<T>
where
    F: FnOnce() -> T,
    F: Send + 'static,
    T: Send + 'static,
{
    Builder::new().spawn(f).expect("failed to spawn thread")
}
pub fn spawn < F , T > ( f : F ) -> JoinHandle < T > where F : FnOnce ( ) -> T , F : Send + ' static , T : Send + ' static , { Builder :: new ( ) . spawn ( f ) . expect ( " " ) }
Spawns a new thread, returning a JoinHandle for it.
Spawns a new thread returning a JoinHandle for it .
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