Move /src/test to /tests

tests/ui/span/send-is-not-static-std-sync.rs

@@ -0,0 +1,55 @@
+// basic tests to see that certain "obvious" errors are caught by
+// these types no longer requiring `'static` (RFC 458)
+
+#![allow(dead_code)]
+
+use std::sync::{Mutex, RwLock, mpsc};
+
+fn mutex() {
+    let x = 1;
+    let y = Box::new(1);
+    let lock = Mutex::new(&x);
+    *lock.lock().unwrap() = &*y;
+    drop(y); //~ ERROR cannot move out
+    {
+        let z = 2;
+        *lock.lock().unwrap() = &z;
+    }
+    //~^^ ERROR `z` does not live long enough
+    lock.use_ref(); // (Mutex is #[may_dangle] so its dtor does not use `z` => needs explicit use)
+}
+
+fn rwlock() {
+    let x = 1;
+    let y = Box::new(1);
+    let lock = RwLock::new(&x);
+    *lock.write().unwrap() = &*y;
+    drop(y); //~ ERROR cannot move out
+    {
+        let z = 2;
+        *lock.write().unwrap() = &z;
+    }
+    //~^^ ERROR `z` does not live long enough
+    lock.use_ref(); // (RwLock is #[may_dangle] so its dtor does not use `z` => needs explicit use)
+}
+
+fn channel() {
+    let x = 1;
+    let y = Box::new(1);
+    let (tx, rx) = mpsc::channel();
+
+    tx.send(&x).unwrap();
+    tx.send(&*y);
+    drop(y); //~ ERROR cannot move out
+    {
+        let z = 2;
+        tx.send(&z).unwrap();
+    }
+    //~^^ ERROR `z` does not live long enough
+    // (channels lack #[may_dangle], thus their dtors are implicit uses of `z`)
+}
+
+fn main() {}
+
+trait Fake { fn use_mut(&mut self) { } fn use_ref(&self) { }  }
+impl<T> Fake for T { }