On 5.0.99.6; #lang lazy
(define ones (cons 1 ones)) (define ints (cons 1 (map + ints ones))) (+ (list-ref (take 15 ints) 1234)) 2) produces 1237 'take' doesn't produce a proper list (which has a 'null' in the end), instead it produces a list with an element and a promise. When another function needs to go on with the rest, it sees that promise and can continue with that., instead of seeing a 'null' and produce an error. That's a bug I think. -- caner p.s. With the same program, I got an error on 5.0.1 On 01/26/2011 10:40 AM, Mark Engelberg wrote: > I get an error in 5.0.2, rather than 0. > > --Mark > > P.S. I was surprised to see that list-ref in #lang lazy takes the args > in opposite order than in #lang racket (which takes the list first). > > On Tue, Jan 25, 2011 at 11:27 PM, John Clements > <[email protected] <mailto:[email protected]>> wrote: > > I would expect this program to signal an error: > > #lang lazy > > (define zeros (cons 0 zeros)) > > (define should-be-error (list-ref (take 15 zeros) 1324)) > > > ... but instead should-be-error is bound to zero. How can I take > the 1000th element of a list with only 15 elements? I'm tempted > to make snide comments about laziness, but I'm sure it'll backfire > when it turns out that somehow that's the right answer after all. > > Bug report? > > John >
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