public Builder clearSourceVersion() {
        bitField0_ = (bitField0_ & ~0x00000040);
        sourceVersion_ = null;
        if (sourceVersionBuilder_ != null) {
          sourceVersionBuilder_.dispose();
          sourceVersionBuilder_ = null;
        }
        onChanged();
        return this;
      }
<pre>
The version of the deployed source code (up to 128 bytes).
</pre>

<code>.google.devtools.cloudtrace.v2.TruncatableString source_version = 7;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/StackTrace.java