Identify syntax error in array

[MPParsley]

The following snippet should result in an error due to a missing comma after 'line_two' but it doesn't:

{%
set classes = [
  'line_one',
  'line_two'
  'line_three',
]
%}
<div{{ attributes.addClass(classes) }}>
  <h2>{{ content }}</h2>
</div>

$ vendor/bin/twigcs templates 
No violation found.

[OwlyCode]

I looked around what causes this issue and it is due to the lack of parsing from twigcs. We only tokenize in order to check the codestyle. We would need to use the parser to make sure the files are valid.