bogus-const.js

const assignLater = (a) => {
  const x

  if (a === 1) {
    x = 1             // XXX nope, must assign at declaration time
  } else {
    x = 2             // XXX nope, must assign at declaration time
  }
}

const shadowVars = () => {
  var v
  let el
  const v = 1, el = 2 // XXX cannot redeclare as const
}

const reassignDuh = () => {
  const v = 1
  v = 2               // XXX come on...
}

const redeclare = () => {
  const v = 1
  const v = 1         // XXX not even if the value is the same
}

const outsideScope = (a) => {
  if (a === 1) {
    // this declaration of y is scoped only to this block
    const y = 3
  } 

  console.log('y', y) // XXX y is not defined here
}