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Fix hygienic macro example in racket.html.markdown

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Gustavo Schmidt 2013-07-28 21:43:21 -03:00
parent a7fe2983cc
commit 3c3fb64820
1 changed files with 10 additions and 5 deletions
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racket.html.markdown
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@ -5,6 +5,7 @@ filename: learnracket.rkt
contributors: contributors:
- ["th3rac25", "https://github.com/voila"] - ["th3rac25", "https://github.com/voila"]
- ["Eli Barzilay", "https://github.com/elibarzilay"] - ["Eli Barzilay", "https://github.com/elibarzilay"]
- ["Gustavo Schmidt", "https://github.com/gustavoschmidt"]
--- ---
Racket is a general purpose, multi-paradigm programming language in the Lisp/Scheme family. Racket is a general purpose, multi-paradigm programming language in the Lisp/Scheme family.
@ -555,11 +556,15 @@ vec ; => #(1 2 3 4)
(set! x y) (set! x y)
(set! y tmp))) (set! y tmp)))
(define tmp 1) (define tmp 2)
(define a 2) (define other 3)
(define b 3) (swap! tmp other)
(swap! a b) (printf "tmp = ~a; other = ~a\n" tmp other)
(printf "tmp = ~a; a = ~a; b = ~a\n" tmp a b) ; tmp is unaffected ;; The variable `tmp` is renamed to `tmp_1`
;; in order to avoid name conflict
;; (let ([tmp_1 tmp])
;; (set! tmp other)
;; (set! other tmp_1))
;; But they are still code transformations, for example: ;; But they are still code transformations, for example:
(define-syntax-rule (bad-while condition body ...) (define-syntax-rule (bad-while condition body ...)