How to construct SyntaxContext from usize

[hyf0]

I saw these codes were commented out.
https://github.com/swc-project/swc/blob/main/crates/swc_common/src/syntax_pos/hygiene.rs#L203-L209

What's the relationship between SyntaxContext and Mark?. It looks like SyntaxContext must be derived from a Mark.

Or Is there any material I could learn about it?

[kdy1]

SyntaxContext contains 0+ marks. SyntaxContext::empty() has 0 mark, and you can add Mark by calling .apply(mark).

You should not create SyntaxContext from usize.