Eliminate FnBox following rust-lang/rust#55431

Author: jonhoo

noria-server/src/controller/mod.rs

@@ -136,7 +136,7 @@ pub(super) fn main<A: Authority + 'static>(
                     if let Some(ref mut ctrl) = controller {
                         if !ctrl.workers.is_empty() {
                             crate::block_on(|| {
-                                ctrl.migrate(move |m| f.call_box((m,)));
+                                ctrl.migrate(move |m| f(m));
                                 done.send(()).unwrap();
                             });
                         }

noria-server/src/lib.rs

@@ -354,7 +354,6 @@
 #![feature(box_syntax)]
 #![feature(nll)]
 #![feature(try_blocks)]
-#![feature(fnbox)]
 #![feature(vec_remove_item)]
 #![feature(crate_visibility_modifier)]
 #![deny(missing_docs)]

noria-server/src/startup.rs

@@ -8,7 +8,6 @@ use noria::consensus::Authority;
 use noria::ControllerDescriptor;
 use rand;
 use slog;
-use std::boxed::FnBox;
 use std::io;
 use std::net::{IpAddr, SocketAddr};
 use std::sync::Arc;
@@ -38,7 +37,7 @@ crate enum Event {
     #[cfg(test)]
     IsReady(futures::sync::oneshot::Sender<bool>),
     ManualMigration {
-        f: Box<FnBox(&mut crate::controller::migrate::Migration) + Send + 'static>,
+        f: Box<FnOnce(&mut crate::controller::migrate::Migration) + Send + 'static>,
         done: futures::sync::oneshot::Sender<()>,
     },
 }