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tabulary 在另一个环境中失败

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tabulary 在另一个环境中失败

tabulary当我明确写出表头时，该包在下面的设置中运行良好。但是当我在自定义环境中包装完全相同的命令时，TeX 会在 处停止\par，并显示以下消息：

! File ended while scanning use of \TY@get@body.

我如何tabulary在这个环境中使用？

\documentclass{article}
\usepackage{geometry} % need wider textblock for table                                                                                                                                         
\usepackage{parskip}  % everything flushleft with line spaces between paragraphs                                                                                                               
\usepackage{booktabs} % for \toprule                                                                                                                                                           
\usepackage{tabulary}

\newenvironment{schedule}[1]
  {\textsc{#1}\par%                                                                                                                                                                            
    \begin{tabulary}{\textwidth}{llLl}                                                                                                                                                         
    \toprule%                                                                                                                                                                                  
  }
  {\end{tabulary}\par\medskip}

\begin{document}

% Version 1, commands written out, no problem                                                                                                                                                                 
\section*{Herr Dr. Professor}

\textsc{Classes}

\begin{tabulary}{\textwidth}{llLl}
\toprule
Mon., Wed. & 9--10:50 a.m. & Introduction to \TeX, \LaTeX, and friends & Knuth Hall 80\\
Tue. & 12--2:50 p.m. & Seminar: Procrastination through Macros & Lamport Auditorium 95\\
\end{tabulary}

% Version 2, wrapped in environment, will not compile
\section*{Herr Dr. Professor}

\begin{schedule}{Classes}
Mon., Wed. & 9--10:50 a.m. & Introduction to \TeX, \LaTeX, and friends & Knuth Hall 80\\
Tue. & 12--2:50 p.m. & Seminar: Procrastination through Macros & Lamport Auditorium 95\\
\end{schedule}

\end{document}

版本 1 本身可按要求进行编译：

在此处输入图片描述

答案1

这与在另一个环境中创建环境？

手册tabularx上说，为了在另一个环境的定义中使用环境，你必须使用“内部”形式\tabularx和。虽然手册上没有具体说明，但\endtabularx对也是如此。tabulary

\newenvironment{schedule}[1]
  {\textsc{#1}\par
    \tabulary{\textwidth}{llLl}
    \toprule
  }
  {\endtabulary\par\medskip}

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