public Builder setTraces(int index, com.google.devtools.cloudtrace.v1.Trace value) {
      if (tracesBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureTracesIsMutable();
        traces_.set(index, value);
        onChanged();
      } else {
        tracesBuilder_.setMessage(index, value);
      }
      return this;
    }
<pre>
List of traces.
</pre>

<code>repeated .google.devtools.cloudtrace.v1.Trace traces = 1;</code>
java-trace/proto-google-cloud-trace-v1/src/main/java/com/google/devtools/cloudtrace/v1/Traces.java