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Task/String-append/PlainTeX/string-append.tex
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Task/String-append/PlainTeX/string-append.tex
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\def\addtomacro#1#2{\expandafter\def\expandafter#1\expandafter{#1#2}}
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\def\foo{Hello}
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Initial: \foo
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\addtomacro\foo{ world!}
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Appended: \foo
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\bye
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