Comment at last line causing parsing error

[ariady-putra]

What Git revision are you using?

aiken 1.0.4-alpha

What operating system are you using, and which version?

• Linux / Ubuntu 20.04.4 LTS (64-bit)
• Aiken Playground

Describe what the problem is?

Putting comment at the last line of a file gives the unexpected token parsing error. The same behavior is also observed on Aiken Playground (go to play.aiken-lang.org, add // to the last line, click Format or Check)

[File ends at line 21] Not good:

aiken::parser

  × While parsing files...
  ╰─▶ I found an unexpected token '"/"'.

[File ends at line 22] Good:

Aiken Playground:

What should be the expected behavior?

Either automatically add a new empty line upon formatting, or it shouldn't be an error.