Token expansion with the token library

Question

I don't understand how the token library of luatex works.

\documentclass{standalone}

\begin{document}

\def\mymacro{A}

\directlua{%
  t = token.create ('mymacro')
  token.expand(t)
  token.get_next()
}

\end{document}

The token.expand does not work as I expected: luatex says Undefined control sequence. Why?

With the token.get_next(), I don't know exactly what I should get...

Answer 1

Unfortunately token.expand is currently broken. See the bug report which derives from an example exactly like yours.