bug: peek_token

[mhanberg]

** (FunctionClauseError) no function clause matching in Spitfire.peek_token/1
    (spitfire 0.1.0) lib/spitfire.ex:2167: Spitfire.peek_token(%{tokens: [nil | :eot], literal_encoder: #Function<49.133785804/2 in NextLS.handle_request/2>, errors: [{[line: 4, column: 13], "missing closing bracket for list"}], current_token: {:fake_closing_bracket, nil}, fuel: 150, peek_token: nil, nesting: 1})
    (spitfire 0.1.0) lib/spitfire.ex:295: anonymous fn/7 in Spitfire.parse_expression/6
    (spitfire 0.1.0) lib/spitfire/while.ex:49: Spitfire.While.do_while/2
    (spitfire 0.1.0) lib/spitfire.ex:1875: Spitfire.parse_identifier/1
    (spitfire 0.1.0) lib/spitfire.ex:283: Spitfire.parse_expression/6
    (spitfire 0.1.0) lib/spitfire.ex:936: anonymous fn/1 in Spitfire.parse_do_block/2
    (spitfire 0.1.0) lib/spitfire/while.ex:5: Spitfire.While2.recurse/3
    (spitfire 0.1.0) lib/spitfire/while.ex:10: Spitfire.While2.recurse/3

[mhanberg]

I believe this is related to the tokenizer not handling the follow type of code

iex(5)> :elixir_tokenizer.tokenize(~c"[foo:]", 1, 1, [])
{:error,
 {[line: 1, column: 2], ~c"keyword argument must be followed by space after: ",
  ~c"foo:"}, ~c"foo:]", [], ["[": {1, 1, nil}]}

[mhanberg]

Related to #31