add missing end if

book.tex

@@ -25,7 +25,7 @@
 
 \def\racketEd{0}
 \def\pythonEd{1}
-\def\edition{1}
+\def\edition{0}
 
 % material that is specific to the Racket edition of the book
 \newcommand{\racket}[1]{{\if\edition\racketEd{#1}\fi}}
@@ -14946,6 +14946,7 @@ class TypeCheckLlambda(TypeCheckLfun):
 \caption{Type checking the \key{lambda}'s in \LangLam{}, part 2.}
 \label{fig:type-check-Llambda-part2}
 \end{figure}
+\fi}
 
 \clearpage