error[E0277]: `std::sync::mpsc::Receiver<()>` cannot be shared between threads safely --> $DIR/closure-move-sync.rs:6:27 | LL | let t = thread::spawn(|| { | _____________-------------_^ | | | | | required by a bound introduced by this call LL | | recv.recv().unwrap(); LL | | LL | | }); | |_____^ `std::sync::mpsc::Receiver<()>` cannot be shared between threads safely | = help: the trait `Sync` is not implemented for `std::sync::mpsc::Receiver<()>` = note: required for `&std::sync::mpsc::Receiver<()>` to implement `Send` note: required because it's used within this closure --> $DIR/closure-move-sync.rs:6:27 | LL | let t = thread::spawn(|| { | ^^ note: required by a bound in `spawn` --> $SRC_DIR/std/src/thread/mod.rs:LL:COL | LL | F: Send + 'static, | ^^^^ required by this bound in `spawn` error[E0277]: `Sender<()>` cannot be shared between threads safely --> $DIR/closure-move-sync.rs:18:19 | LL | thread::spawn(|| tx.send(()).unwrap()); | ------------- ^^^^^^^^^^^^^^^^^^^^^^^ `Sender<()>` cannot be shared between threads safely | | | required by a bound introduced by this call | = help: the trait `Sync` is not implemented for `Sender<()>` = note: required for `&Sender<()>` to implement `Send` note: required because it's used within this closure --> $DIR/closure-move-sync.rs:18:19 | LL | thread::spawn(|| tx.send(()).unwrap()); | ^^ note: required by a bound in `spawn` --> $SRC_DIR/std/src/thread/mod.rs:LL:COL | LL | F: Send + 'static, | ^^^^ required by this bound in `spawn` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0277`.