Syntax:  ERASE PLACEHOLDER next_placeholder_boolean

  Erases a placeholder in the current direction.

  If the cursor is on a placeholder, the deletion occurs in place.  If
  no placeholder is found, LSE returns an error message.  After erasing
  the placeholder and any leading tabs or blanks, LSE erases any
  leading separator text or leading and trailing punctuation.  If the
  resulting line or line segment is now empty, LSE erases the entire
  line or line segment.