public Builder mergeFrom(
          com.google.cloud.workflows.executions.v1.Execution.StackTrace other) {
        if (other
            == com.google.cloud.workflows.executions.v1.Execution.StackTrace.getDefaultInstance())
          return this;
        if (elementsBuilder_ == null) {
          if (!other.elements_.isEmpty()) {
            if (elements_.isEmpty()) {
              elements_ = other.elements_;
              bitField0_ = (bitField0_ & ~0x00000001);
            } else {
              ensureElementsIsMutable();
              elements_.addAll(other.elements_);
            }
            onChanged();
          }
        } else {
          if (!other.elements_.isEmpty()) {
            if (elementsBuilder_.isEmpty()) {
              elementsBuilder_.dispose();
              elementsBuilder_ = null;
              elements_ = other.elements_;
              bitField0_ = (bitField0_ & ~0x00000001);
              elementsBuilder_ =
                  com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders
                      ? getElementsFieldBuilder()
                      : null;
            } else {
              elementsBuilder_.addAllMessages(other.elements_);
            }
          }
        }
        this.mergeUnknownFields(other.getUnknownFields());
        onChanged();
        return this;
      }
<pre>
A collection of stack elements (frames) where an error occurred.
</pre>

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