private void buildPartial0(
          com.google.cloud.workflows.executions.v1.Execution.StackTraceElement result) {
        int from_bitField0_ = bitField0_;
        if (((from_bitField0_ & 0x00000001) != 0)) {
          result.step_ = step_;
        }
        if (((from_bitField0_ & 0x00000002) != 0)) {
          result.routine_ = routine_;
        }
        int to_bitField0_ = 0;
        if (((from_bitField0_ & 0x00000004) != 0)) {
          result.position_ = positionBuilder_ == null ? position_ : positionBuilder_.build();
          to_bitField0_ |= 0x00000001;
        }
        result.bitField0_ |= to_bitField0_;
      }
<pre>
A single stack element (frame) where an error occurred.
</pre>

Protobuf type {@code google.cloud.workflows.executions.v1.Execution.StackTraceElement}
java-workflow-executions/proto-google-cloud-workflow-executions-v1/src/main/java/com/google/cloud/workflows/executions/v1/Execution.java