source: |
  cal {}
  cal {One long, otherwise invalid token.}
  cal {Outer {nested} outer}
reference: |
  program
    statementOrScope
      statement
        calStatement
          cal
          {
          }
    statementOrScope
      statement
        calStatement
          cal
          {
          One long, otherwise invalid token.
          }
    statementOrScope
      statement
        calStatement
          cal
          {
          Outer {nested} outer
          }
    <EOF>
