{(), ()}
{"", ""}
{(), ""}
{"", ()}
{:a, :b}
{:a, :b, :c}
{:a, :b, :c, :d}
{:a, :b, :c, :d, :e}
{:a, :b, :c, :d, :e, :f}
{:a, :b, :c, :d, :e, :f, :g}
{:a, :b, :c, :d, :e, :f, :g, :h}
{:a, :b, :c, :d, :e, :f, :g, :h, :i}
{:a, :b, :c, :d, :e, :f, :g, :h, :i, :j}
{{:a, :b}, {:c, :d}}
{{:a, :b}, {:c, :d}, {:e, :f}}
{{:a, :b}, {:c, :d}, {:e, :f}, {:g, :h}}
{{:a, :b}, {:c, :d}, {:e, :f}, {:g, :h}, {:i, :j}}

# comment 0
# comment 0b
{ # comment 1
  # comment 1b
  :a # comment 2
     # comment 2b
  , # comment 3
    # comment 3b
  :b ## comment 4
     ## comment 4b
  , ## comment 5
    ## comment 5b
  :c ## comment 6
     ## comment 6b
  } ## comment 7
    ## comment 7b

# comment 10
{ # comment 11
  a # comment 12
  , # comment 13
  b ## comment 14
  , ## comment 15
  c ## comment 16
  } ## comment 17
