考试课程 2.6：在第一个问题之前使用依赖于 \printanswers 的自定义环境

Question

自从考试类更新到 2.6 版后，我就不能再使用依赖于第一个问题之前的 \printanswers 的自定义环境了。（我使用这解决方案。）

通过考试 2.5 级，我能够做到

\documentclass{exam}
\usepackage{framed}

\newenvironment{note}{%
    \ifprintanswers
        \begin{framed}\noindent\textbf{Note:}\par\noindent
    \else
        \setbox0\vbox\bgroup
    \fi
}{%
    \ifprintanswers
        \end{framed}%
    \else
        \egroup
    \fi%
}

\printanswers
%\noprintanswers

\begin{document}
\begin{questions}
\begin{note}
    this is a note
\end{note}
\question
question
\begin{solution}
    this is the solution
\end{solution}
\begin{note}
    this is another note
\end{note}
\end{questions}
\end{document}

但是在考试级别 2.6 中我总是收到这个错误：

! LaTeX Error: Something's wrong--perhaps a missing \item.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.25 \end{note}

Answer 1

解决方案是将第一个注释环境移出问题环境。使用注释包的替代解决方案导致了与上述相同的错误。

\documentclass{exam}
\usepackage{framed}

\newenvironment{note}{%
    \ifprintanswers
        \begin{framed}\noindent\textbf{Note:}\par\noindent
    \else
        \setbox0\vbox\bgroup
    \fi
}{%
    \ifprintanswers
        \end{framed}%
    \else
        \egroup
    \fi%
}

\printanswers
%\noprintanswers

\begin{document}
\begin{note}
    this is a note
\end{note}
\begin{questions}
\question
question
\begin{solution}
    this is the solution
\end{solution}
\begin{note}
    this is another note
\end{note}
\end{questions}
\end{document}