diff --git a/src/libcore/future.rs b/src/libcore/future.rs
index 82deaf895376..48fad44ff471 100644
--- a/src/libcore/future.rs
+++ b/src/libcore/future.rs
@@ -33,7 +33,11 @@ export future_pipe;
 
 #[doc = "The future type"]
 struct Future<A> {
-    /*priv*/ mut state: FutureState<A>,
+    /*priv*/ mut state: FutureState<A>;
+
+    // FIXME(#2829) -- futures should not be copyable, because they close
+    // over fn~'s that have pipes and so forth within!
+    drop {}
 }
 
 priv enum FutureState<A> {
@@ -88,7 +92,7 @@ fn from_port<A:Send>(+port: future_pipe::client::waiting<A>) -> Future<A> {
         port_ <-> *port;
         let port = option::unwrap(port_);
         match recv(port) {
-          future_pipe::completed(move data) => data
+            future_pipe::completed(move data) => data
         }
     }
 }
diff --git a/src/libcore/unsafe.rs b/src/libcore/unsafe.rs
index 5539aa7d89e4..6f2e3f94ca2b 100644
--- a/src/libcore/unsafe.rs
+++ b/src/libcore/unsafe.rs
@@ -415,13 +415,13 @@ mod tests {
 
         for uint::range(0u, num_tasks) |_i| {
             let total = total.clone();
-            futures += ~[future::spawn(|| {
+            vec::push(futures, future::spawn(|| {
                 for uint::range(0u, count) |_i| {
                     do total.with |count| {
                         **count += 1u;
                     }
                 }
-            })];
+            }));
         };
 
         for futures.each |f| { f.get() }