From 1a5d792eb948a32c38691b57b4604755b9018157 Mon Sep 17 00:00:00 2001
From: TianlinZhao <tianlinzhao@google.com>
Date: Thu, 30 Jul 2020 20:04:58 -0400
Subject: [PATCH] tracer

---
 api/include/opentelemetry/trace/default_tracer.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/api/include/opentelemetry/trace/default_tracer.h b/api/include/opentelemetry/trace/default_tracer.h
index cf868abf60..cb8126d174 100644
--- a/api/include/opentelemetry/trace/default_tracer.h
+++ b/api/include/opentelemetry/trace/default_tracer.h
@@ -23,8 +23,7 @@ class DefaultTracer: public Tracer {
                                     const KeyValueIterable &attributes,
                                     const StartSpanOptions &options = {}) noexcept
   {
-    return nostd::unique_ptr<Span>(nullptr);
-//     return DefaultSpan::GetInvalid();
+     return nostd::unique_ptr<Span>(new DefaultSpan::GetInvalid());
   }
 
   void ForceFlushWithMicroseconds(uint64_t timeout) noexcept