}
func getWorkflowVersion(ctx workflow.Context, unsafeWorkflowVersionGetter func() DeploymentWorkflowVersion) DeploymentWorkflowVersion {
workflow.go
if workflow.GetVersion(ctx, "workflowVersionAdded", workflow.DefaultVersion, 0) >= 0 {
var ver DeploymentWorkflowVersion
err := workflow.MutableSideEffect(ctx, "workflowVersion",