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Bug fix in lambda labeling. #43

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Merged
dvanhorn merged 1 commit into from
Oct 28, 2019
Merged

Bug fix in lambda labeling. #43

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2 changes: 1 addition & 1 deletion www/notes/loot/syntax.rkt
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Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,7 @@
[`(if ,e0 ,e1 ,e2) (append (λs e0) (λs e1) (λs e2))]
[`(+ ,e0 ,e1) (append (λs e0) (λs e1))]
[`(let ((,x ,e0)) ,e1) (append (λs e0) (λs e1))]
[`(letrec ,bs ,e0) (append (map second bs) (λs e0))]
[`(letrec ,bs ,e0) (append (apply append (map (compose λs second) bs)) (λs e0))]
[`(λ ,xs ,l ,e0) (cons e (λs e0))]
[`(,e . ,es) (append (λs e) (apply append (map λs es)))]))

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42 changes: 41 additions & 1 deletion www/notes/loot/test/compile.rkt
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Expand Up @@ -89,5 +89,45 @@
(+ n (tri (sub1 n)))))))
10))
56)


(check-equal?
(run
'(begin (define (map f ls)
(if (empty? ls)
'()
(cons (f (car ls)) (map f (cdr ls)))))

(map (λ (f) (f 0))
(cons (λ (x) (add1 x))
(cons (λ (x) (sub1 x))
'())))))
'(1 -1))

(check-equal?
(run
'(begin (define (map f ls)
(letrec ((mapper (λ (ls)
(if (empty? ls)
'()
(cons (f (car ls)) (mapper (cdr ls)))))))
(mapper ls)))
(map (λ (f) (f 0))
(cons (λ (x) (add1 x))
(cons (λ (x) (sub1 x))
'())))))
'(1 -1))

(check-equal?
(run
'(begin (define (map f ls)
(begin (define (mapper ls)
(if (empty? ls)
'()
(cons (f (car ls)) (mapper (cdr ls)))))
(mapper ls)))
(map (λ (f) (f 0))
(cons (λ (x) (add1 x))
(cons (λ (x) (sub1 x))
'())))))
'(1 -1))