stage("Parallel stages") {
    parallel {
        stage("Stage 1"){
            agent none
            steps {
                script {
                    // sleep 10 // when sleeping long enough, stages behave correctly.
                    error("Which post step will get executed?")
                }
            }
            post {
                success {
                    echo "Stage 1 success!"
                }
                failure {
                    echo "Stage 1 failure!"
                }
            }
        }
        stage("Stage 2"){
            agent none
            steps {
                script {
                    echo "Stage 2 code executing..."
                }
            }
            post {
                success {
                    echo "Stage 2 success!"
                }
                failure {
                    echo "Stage 2 failure!"
                }
            }
        }
    }
    post {
        success {
            echo "Parallel post steps success!"
        }
        failure {
            echo "Parallel post steps failure!"
        }
    }
}