diff --git a/src/libcore/arc.rs b/src/libcore/arc.rs
index ddbc4e8321f..7e8d69298bd 100644
--- a/src/libcore/arc.rs
+++ b/src/libcore/arc.rs
@@ -24,17 +24,19 @@ fn rust_atomic_decrement(p: &mut libc::intptr_t)
     data: T
 };
 
-resource arc_destruct<T>(data: *libc::c_void) {
-    unsafe {
-        let data: ~arc_data<T> = unsafe::reinterpret_cast(data);
-        let new_count = rustrt::rust_atomic_decrement(&mut data.count);
-        assert new_count >= 0;
-        if new_count == 0 {
-            // drop glue takes over.
-        } else {
-            unsafe::forget(data);
-        }
-    }
+class arc_destruct<T> {
+  let data: *libc::c_void;
+  new(data: *libc::c_void) { self.data = data; }
+  drop unsafe {
+     let data: ~arc_data<T> = unsafe::reinterpret_cast(self.data);
+     let new_count = rustrt::rust_atomic_decrement(&mut data.count);
+     assert new_count >= 0;
+     if new_count == 0 {
+         // drop glue takes over.
+     } else {
+       unsafe::forget(data);
+     }
+  }
 }
 
 type arc<T: const> = arc_destruct<T>;
@@ -52,7 +54,7 @@ fn arc<T: const>(-data: T) -> arc<T> {
  wrapper."]
 fn get<T: const>(rc: &a.arc<T>) -> &a.T {
     unsafe {
-        let ptr: ~arc_data<T> = unsafe::reinterpret_cast(**rc);
+        let ptr: ~arc_data<T> = unsafe::reinterpret_cast((*rc).data);
         // Cast us back into the correct region
         let r = unsafe::reinterpret_cast(&ptr.data);
         unsafe::forget(ptr);
@@ -67,12 +69,12 @@ fn get<T: const>(rc: &a.arc<T>) -> &a.T {
 allowing them to share the underlying data."]
 fn clone<T: const>(rc: &arc<T>) -> arc<T> {
     unsafe {
-        let ptr: ~arc_data<T> = unsafe::reinterpret_cast(**rc);
+        let ptr: ~arc_data<T> = unsafe::reinterpret_cast((*rc).data);
         let new_count = rustrt::rust_atomic_increment(&mut ptr.count);
         assert new_count >= 2;
         unsafe::forget(ptr);
     }
-    arc_destruct(**rc)
+    arc_destruct((*rc).data)
 }
 
 // An arc over mutable data that is protected by a lock.
@@ -93,17 +95,19 @@ impl methods<T: send> for exclusive<T> {
     fn clone() -> exclusive<T> {
         unsafe {
             // this makes me nervous...
-            let ptr: ~arc_data<ex_data<T>> = unsafe::reinterpret_cast(*self);
+            let ptr: ~arc_data<ex_data<T>> =
+                  unsafe::reinterpret_cast(self.data);
             let new_count = rustrt::rust_atomic_increment(&mut ptr.count);
             assert new_count > 1;
             unsafe::forget(ptr);
         }
-        arc_destruct(*self)
+        arc_destruct(self.data)
     }
 
     fn with<U>(f: fn(sys::condition, x: &T) -> U) -> U {
         unsafe {
-            let ptr: ~arc_data<ex_data<T>> = unsafe::reinterpret_cast(*self);
+            let ptr: ~arc_data<ex_data<T>> =
+                  unsafe::reinterpret_cast(self.data);
             let r = {
                 let rec: &ex_data<T> = &(*ptr).data;
                 rec.lock.lock_cond() {|c|
@@ -123,8 +127,10 @@ fn with<U>(f: fn(sys::condition, x: &T) -> U) -> U {
 // (terminate, get)
 type shared_arc<T: const send> = (shared_arc_res, get_chan<T>);
 
-resource shared_arc_res(c: comm::chan<()>) {
-    c.send(());
+class shared_arc_res {
+   let c: comm::chan<()>;
+   new(c: comm::chan<()>) { self.c = c; }
+   drop { self.c.send(()); }
 }
 
 fn shared_arc<T: send const>(-data: T) -> shared_arc<T> {
diff --git a/src/libcore/priv.rs b/src/libcore/priv.rs
index fc1e547ebde..922d7c72819 100644
--- a/src/libcore/priv.rs
+++ b/src/libcore/priv.rs
@@ -181,8 +181,12 @@ unsafe fn weaken_task(f: fn(comm::port<()>)) unsafe {
     let _unweaken = unweaken(ch);
     f(po);
 
-    resource unweaken(ch: comm::chan<()>) unsafe {
-        rustrt::rust_task_unweaken(unsafe::reinterpret_cast(ch));
+    class unweaken {
+      let ch: comm::chan<()>;
+      new(ch: comm::chan<()>) { self.ch = ch; }
+      drop unsafe {
+        rustrt::rust_task_unweaken(unsafe::reinterpret_cast(self.ch));
+      }
     }
 }
 
diff --git a/src/libcore/rand.rs b/src/libcore/rand.rs
index f5e404712b9..99ac4addc78 100644
--- a/src/libcore/rand.rs
+++ b/src/libcore/rand.rs
@@ -230,10 +230,14 @@ fn shuffle_mut<T>(&&values: [mut T]) {
 
 }
 
-resource rand_res(c: *rctx) { rustrt::rand_free(c); }
+class rand_res {
+    let c: *rctx;
+    new(c: *rctx) { self.c = c; }
+    drop { rustrt::rand_free(self.c); }
+}
 
 impl of rng for @rand_res {
-    fn next() -> u32 { ret rustrt::rand_next(**self); }
+    fn next() -> u32 { ret rustrt::rand_next((*self).c); }
 }
 
 #[doc = "Create a new random seed for seeded_rng"]
diff --git a/src/libcore/run.rs b/src/libcore/run.rs
index 401454c40df..4183056b741 100644
--- a/src/libcore/run.rs
+++ b/src/libcore/run.rs
@@ -170,9 +170,9 @@ fn run_program(prog: str, args: [str]) -> int {
 #[doc ="
 Spawns a process and returns a program
 
-The returned value is a boxed resource containing a <program> object that can
-be used for sending and recieving data over the standard file descriptors.
-The resource will ensure that file descriptors are closed properly.
+The returned value is a boxed class containing a <program> object that can
+be used for sending and receiving data over the standard file descriptors.
+The class will ensure that file descriptors are closed properly.
 
 # Arguments
 
@@ -181,7 +181,7 @@ fn run_program(prog: str, args: [str]) -> int {
 
 # Return value
 
-A boxed resource of <program>
+A class with a <program> field
 "]
 fn start_program(prog: str, args: [str]) -> program {
     let pipe_input = os::pipe();
@@ -221,16 +221,20 @@ fn destroy_repr(r: prog_repr) {
        libc::fclose(r.out_file);
        libc::fclose(r.err_file);
     }
-    resource prog_res(r: prog_repr) { destroy_repr(r); }
+    class prog_res {
+        let r: prog_repr;
+        new(-r: prog_repr) { self.r = r; }
+        drop { destroy_repr(self.r); }
+    }
 
     impl of program for prog_res {
-        fn get_id() -> pid_t { ret self.pid; }
-        fn input() -> io::writer { io::fd_writer(self.in_fd, false) }
-        fn output() -> io::reader { io::FILE_reader(self.out_file, false) }
-        fn err() -> io::reader { io::FILE_reader(self.err_file, false) }
-        fn close_input() { close_repr_input(*self); }
-        fn finish() -> int { finish_repr(*self) }
-        fn destroy() { destroy_repr(*self); }
+        fn get_id() -> pid_t { ret self.r.pid; }
+        fn input() -> io::writer { io::fd_writer(self.r.in_fd, false) }
+        fn output() -> io::reader { io::FILE_reader(self.r.out_file, false) }
+        fn err() -> io::reader { io::FILE_reader(self.r.err_file, false) }
+        fn close_input() { close_repr_input(self.r); }
+        fn finish() -> int { finish_repr(self.r) }
+        fn destroy() { destroy_repr(self.r); }
     }
     let repr = {pid: pid,
                 mut in_fd: pipe_input.out,