doc-src/TutorialI/Datatype/document/unfoldnested.tex
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     1 \begin{isabelle}%
       
     2 \isacommand{datatype}~('a,'b){"}term{"}~=~Var~'a~|~App~'b~{"}('a,'b)term\_list{"}\isanewline
       
     3 \isakeyword{and}~('a,'b)term\_list~=~Nil~|~Cons~{"}('a,'b)term{"}~{"}('a,'b)term\_list{"}\end{isabelle}%