> I'm not sure which part you don't understand, so I'll stick to
> generic ideas:

Thanks that helped a lot and enabled me to figure out what to ask!

> So we first call `hcl--syntax-propertize-heredoc` which should detect
> when we're inside a heredoc and if so process it until its end and if not
> do nothing.

I'm struggling to understand what `hcl--syntax-propertize-heredoc` is
doing.
Could you provide a high level explanation like you did with
`hcl--syntax-propertize-function`.
That helped me a lot.

Cheers,
Reza