--- # Implicit empty plain scalars do not produce tokens.
--- a plain scalar
--- 'a single-quoted scalar'
--- "a double-quoted scalar"
--- |-
  a literal scalar (|-)

  test


--- >-
  a folded (>-)
  scalar

  test



--- |
  a literal scalar (|)
--- >
  a folded (>)
  scalar
--- |+
  a literal scalar (|+)
--- >+
  a folded (>+)
  scalar