#let panicOnPlaceholder = state("panicOnPlaceholder", true)

// Return the value with a colorful background so it is visibly a placeholder.
// Has the ability to panic if panicOnPlaceholder is set to true.
#let placeholder(value) = {
  highlight(
    fill: rgb(0xff, 0xa2, 0x9c, 0xff),
    value
  )

  context(
    if panicOnPlaceholder.get() {
      panic("Found placeholder and panicOnPlaceholder is set.")
    }
  )
}

// rawPlaceholder returns the very same value and type without altering it.
// Has the ability to panic if panicOnPlaceholder is set to true.
#let rawPlaceholder(value) = {
  context(
    if panicOnPlaceholder.get() {
      panic("Found placeholder and panicOnPlaceholder is set.")
    }
  )

  return value
}