Boundary Points of Env Blocks

<..html latex lists ..>+
\pend:def\endlist{%
   \if@newlist
      \:warning{Problem with ’list’ environment. Expected syntax:
          \string\begin{list}{label}{spacing}
          \string\item .... \string\end{list}}%
      \global\@newlistfalse
   \fi
}
-_-_-

<..html latex lists ..>+
\def\list:save{%
    \let\SVempty:D:T:D=\empty:D:T:D
    \let\SVend:DL=\end:DL
    \let\SV:DT=\:DT
    \let\SV:DD=\:DD }
\def\list:recall{%
    \global\let\empty:D:T:D=\SVempty:D:T:D
    \global\let\end:DL=\SVend:DL
    \global\let\:DT=\SV:DT
    \global\let\:DD=\SV:DD }
-_-_-

The \@newlistfalse inserted for handling the following case:

    \documentclass{article}
    \begin{document}
    \catcode‘\@=11
    \begin{list}{}         %<-- missing argument
    \item
    \hshow{-----item:NEW------------------------->\if@newlist NEW\else OLD\fi}%
    a
    \hshow{-----/item:OLD------------------------>\if@newlist NEW\else OLD\fi}%
    \end{list}

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