Remarkable to hear that Microsoft is replacing edgeHTML and Chakra with Blink and V8 in Edge! https://techcrunch.com/2018/12/06/microsoft-edge-goes-chromium-and-macos/
As the article comments, by limiting Edge to Windows 10, it couldn't gain enough market share to get many web developers to support it.
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ASTs typically discard comments, and that's usually what you want.
The only time (AFAICS) that preserving comments is useful is for writing a code formatter.
Could you write a formatter in terms of a list of lexemes? A CST is a non-trivial bit of code for one use case.
It is remarkably hard to escape command line arguments safely on Windows, and the standard libraries of multiple languages have needed patching: https://flatt.tech/research/posts/batbadbut-you-cant-securely-execute-commands-on-windows/
Copilot doesn't offer a way of disabling completion inside comments. People have discovered a comical workaround: swearing in the comment! https://github.com/orgs/community/discussions/8062#discussioncomment-11902740