================================================================================
argument
================================================================================
argument: {arg}
tuple: {arg,arg}
keycode: CTRL-R {CTRL-R} {register CTRL-F}
list of { uri:string, name: string } tables
optional argument: {arg}?


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

(help_file
  (block
    (line
      (word)
      (argument
        (word)))
    (line
      (word)
      (argument
        (word)))
    (line
      (word)
      (keycode)
      (argument
        (word))
      (word)
      (ERROR
        (word))
      (keycode)
      (word))
    (line
      (word)
      (word)
      (word)
      (word)
      (word)
      (word)
      (word)
      (word)
      (word))
    (line
      (word)
      (word)
      (argument
        (word)))))

================================================================================
multiple arguments on the same line
================================================================================
{foo} {bar} {baz}


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

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

================================================================================
argument in parentheses
================================================================================
({aaa})
vim.foo({bar})
vim.foo( {bar})
nvim_foo({bar})
nvim_foo({bar},{baz})
nvim_foo({bar}, {baz})
nvim_buf_detach_event[{buf}]


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

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

================================================================================
NOT an argument
================================================================================
a '{' '}' block
{foo "{bar}" `{baz}` |{baz| } {}
foo { bar
{ {} foo{{ foo{{{
 {{
 {{{
{ }	foo
,	inside { }:
\}	literal } x
\{	literal { x

===============
3. Netrw *netrw-ref* {{{1

EXTERNAL *netrw-externapp* {{{2


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

(help_file
  (block
    (line
      (word)
      (word)
      (word)
      (word)
      (word)
      (word))
    (line
      (word)
      (ERROR
        (word))
      (word)
      (codespan
        (word))
      (taglink
        (word))
      (word)
      (word))
    (line
      (word)
      (word)
      (word))
    (line
      (word)
      (word)
      (word)
      (word))
    (line
      (word))
    (line
      (word))
    (line
      (word)
      (word)
      (word))
    (line
      (word)
      (word)
      (word)
      (word))
    (line
      (word)
      (word)
      (word)
      (word))
    (line
      (word)
      (word)
      (word)
      (word)))
  (block
    (line
      (h1
        (delimiter)
        (heading
          (word)
          (word))
        (tag
          (word))
        (word))))
  (block
    (line
      (h3
        (heading)
        (tag
          (word))
        (word)))))