Simple Statements
  The only kind of simple statement is an expression evaluated for its
  side effects. Every simple statement must be terminated with a
  semicolon, unless it is the final statement in a block, in which case
  the semicolon is optional. (A semicolon is still encouraged if the block
  takes up more than one line, because you may eventually add another
  line.) Note that there are some operators like "eval {}" and "do {}"
  that look like compound statements, but aren't (they're just TERMs in an
  expression), and thus need an explicit termination if used as the last
  item in a statement.