// src/core/instance/index.js
function Vue (options) {
if (process.env.NODE_ENV !...== 'production' &&
!..._c = (a, b, c, d) => createElement(vm, a, b, c, d, false)
vm....When the children contains constructs that always generated nested Arrays,
// e.g....$el, vnode, hydrating, false /* removeOnly */)
} else {
// updates
vm.$el = vm.