fixes segfault

cli/ops/plugin.rs

@@ -109,6 +109,10 @@ impl<'a> plugin_api::Interface for PluginInterface<'a> {
     self.isolate_state.op_registry.register(
       name,
       move |isolate_state, zero_copy| {
+        // This is a hack that ensures that dispatch_op_fn is dropped first to
+        // prevent segfaults.
+        dispatch_op_fn;
+        plugin_lib;
         let mut interface = PluginInterface::new(isolate_state, &plugin_lib);
         let op = dispatch_op_fn(&mut interface, zero_copy);
         match op {

core/core_isolate.rs

@@ -147,15 +147,6 @@ impl DerefMut for CoreIsolate {
   }
 }
 
-impl Drop for CoreIsolateState {
-  fn drop(&mut self) {
-    // TODO(afinch7) this is a temporary fix for a segfault that occurus when
-    // dropping plugin ops. I know that the plugin Rc<Library> value gets dropped
-    // early for some reason, but still not quite sure why.
-    drop(std::mem::take(&mut self.op_registry));
-  }
-}
-
 impl Drop for CoreIsolate {
   fn drop(&mut self) {
     if let Some(creator) = self.snapshot_creator.take() {