================================================================================
taglink alone
================================================================================
|world|


--------------------------------------------------------------------------------

(help_file
  (block
    (line
      (taglink
        (word)))))

================================================================================
taglink in text
================================================================================
|(|, |)|, |`|, |{|, |}|.

Hello |world| hello

|-+|	+[num]	line
|-e|	-e	Ex
|-|	-	minus



--------------------------------------------------------------------------------

(help_file
  (block
    (line
      (taglink
        (word))
      (word)
      (taglink
        (word))
      (word)
      (taglink
        (word))
      (word)
      (taglink
        (word))
      (word)
      (taglink
        (word))
      (word)))
  (block
    (line
      (word)
      (taglink
        (word))
      (word)))
  (block
    (line
      (taglink
        (word))
      (word)
      (word)
      (word)
      (word))
    (line
      (taglink
        (word))
      (word)
      (word))
    (line
      (taglink
        (word))
      (word)
      (word))))

================================================================================
taglink in parentheses
================================================================================
(|aaa|) {|aaa|}


--------------------------------------------------------------------------------

(help_file
  (block
    (line
      (word)
      (taglink
        (word))
      (word)
      (argument
        (word)))))

================================================================================
NOT a taglink
================================================================================
whitespace |world foo bar|
	    |
	rx  |
	rx  |	ry
adjacent || |||
table-borders |=========| |---------|

- {event}  (String|Array) event

Note: ":autocmd" can...
'|' works:
	:augroup mine | au! BufRead | augroup END


--------------------------------------------------------------------------------

(help_file
  (block
    (line
      (word)
      (word)
      (ERROR
        (word))
      (word)
      (word))
    (line
      (word))
    (line
      (word)
      (word))
    (line
      (word)
      (word)
      (word))
    (line
      (word)
      (word)
      (word))
    (line
      (word)
      (taglink
        (word))
      (taglink
        (word))))
  (block
    (line_li
      (line
        (argument
          (word))
        (word)
        (word)
        (word))
      (line)))
  (block
    (line
      (note)
      (word)
      (word))
    (line
      (word)
      (word)
      (ERROR
        (word))
      (word))
    (line
      (word)
      (word)
      (word)
      (word)
      (word)
      (word)
      (word)
      (word))))
