public Builder mergeFrom(
          com.google.cloud.workflows.executions.v1.Execution.StackTraceElement other) {
        if (other
            == com.google.cloud.workflows.executions.v1.Execution.StackTraceElement
                .getDefaultInstance()) return this;
        if (!other.getStep().isEmpty()) {
          step_ = other.step_;
          bitField0_ |= 0x00000001;
          onChanged();
        }
        if (!other.getRoutine().isEmpty()) {
          routine_ = other.routine_;
          bitField0_ |= 0x00000002;
          onChanged();
        }
        if (other.hasPosition()) {
          mergePosition(other.getPosition());
        }
        this.mergeUnknownFields(other.getUnknownFields());
        onChanged();
        return this;
      }
<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