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-rw-r--r--src/libcore/task.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/task.rs b/src/libcore/task.rs
index 51f4a7c23cb..9f379bbd94a 100644
--- a/src/libcore/task.rs
+++ b/src/libcore/task.rs
@@ -538,6 +538,7 @@ fn spawn_raw(opts: task_opts, +f: fn~()) {
             new_task_in_new_sched(sched_opts)
           }
         };
+        assert !new_task.is_null();
 
         option::iter(opts.notify_chan) {|c|
             // FIXME (#1087): Would like to do notification in Rust