Help converting function to Vim9 script

The MetaPost plugin in Vim contains the following definition to replace
the n-th occurrence of `beginfig(...)` with `beginfig(n)`:

function! s:fix_beginfigs()
let i = 1
g/^beginfig(\d*);$/s//\='beginfig('.i.');'/ | let i = i + 1
endfunction

command -nargs=0 FixBeginfigs call s:fix_beginfigs()

On attempting to convert it to Vim9 script, I came up with this:

def FixBeginfig()
i = 1
g/^beginfig(\d*);$/s//\='beginfig(' .. i .. ');'/ | i += 1
enddef

command! -buffer -nargs=0 -bar FixBeginfigs call <sid>FixBeginfig()

But this results in 'Undefined variable: i', likely because the command
is not evaluated in Vim9 script context.

Any idea what would be the best way to convert the snippet above?

Thanks,
Life.


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