There is no macro `\vcoffin_gset:Nnw`. How can I achieve that result?

### MWE

```
\documentclass{article}
\usepackage{expl3}\ExplSyntaxOn
\usepackage{mwe}

\newcommand\typesetit {\coffin_typeset:Nnnnn\l_tmpa_coffin{l}{T}{0pt}{0pt}}
\newenvironment{test} {\vcoffin_set:Nnw\l_tmpa_coffin{4in}}{\vcoffin_set_end:}
\newenvironment{test2}{\vcoffin_set:Nnw\l_tmpa_coffin{4in}}{\vcoffin_set_end:\typesetit}

\begin{document}

\begin{test}
  \lipsum[1]
\end{test}
\typesetit % empty :(

\begin{test2}
  \lipsum[1]
\end{test2}
\end{document}

```