|
|
@@ -26,7 +26,7 @@
|
|
|
|
|
|
\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}}
|
|
|
@@ -18680,7 +18680,7 @@ length of the vector.
|
|
|
(define ((interp-Ldyn-exp env) ast)
|
|
|
(define recur (interp-Ldyn-exp env))
|
|
|
(match ast
|
|
|
- [(Var x) (dict-ref env x)]
|
|
|
+ [(Var x) (unbox (lookup x env)]
|
|
|
[(Int n) (Tagged n 'Integer)]
|
|
|
[(Bool b) (Tagged b 'Boolean)]
|
|
|
[(Lambda xs rt body)
|
Jeremy G. Siek