problems with \hbox inside lua

[Mojca Miklavec <mojca.miklavec.lists@gmail.com>]

Dear list,

I cannot figure out what I am doing wrong here. If I remove \hbox, it
works fine, but I would like to draw a table.

\starttext
\startluacode
function draw_table(unicode_start,n_columns)
  for i=0,0xF do
    tex.print('\\dontleavehmode\\definedfont[Serif at 20pt]\\kern0pt')
    for j=0,n_columns do
      --tex.print('\\hbox{ \\char %d }', unicode_start+i*16+j)
      tex.print('\\hbox to 1.5em{\\hss %s \\hss}',
unicode.utf8.char(unicode_start+i*16+j))
    end
    tex.print('\\crlf')
  end
end

draw_table(0x00C0,4)
\stopluacode
\stoptext

Any hints welcome.

Thanks,
    Mojca
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