demo for box opening and closing
% \UseBox 直接忽略参数 | |
\def\UseBox#1{\relax} | |
\newbox\parbox | |
\everypar{\setbox\parbox= | |
\vbox\bgroup | |
\everypar{} | |
\def\par{\egroup\UseBox\parbox}} | |
% 因此,"Hello world!" 被吃进盒子之后没有机会输出 | |
Hello world! | |
\everypar{} | |
% 由于 \everypar 被重定义为空,因此 "Hello Liam!" 正常输出 | |
Hello Liam! | |
\bye |
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