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google / lisp-koans

Common Lisp Koans is a language learning exercise in the same vein as the ruby koans, python koans and others. It is a port of the prior koans with some modifications to highlight lisp-specific features. Structured as ordered groups of broken unit tests, the project guides the learner progressively through many Common Lisp language features.

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arrays.lsp test-adjustable-array initial element

therik opened this issue · comments

commented

Hi, I'm learning through those koans now and I found small mistake:

in test-adjutable-arrays, after the (adjust-array x '(3 4)) the last assert is testing for uninitialized element. According to hyperspecs, the behavior here is undefined, thus probably SBCL specific.
The array after adjusting is: #2A((5 5 0 0) (5 5 0 0) (0 0 0 0)) in SBCL, that's somewhat counter intuitive, I'd expect NILs, not zeroes. It would be nice to put either a comment stating it's SBCL-specific when reading uninitialised element, or perhaps add :initial-element to that adjust-array.
Cheers.

commented

+1. GNU CLISP (2.49) returns #2A((5 5 NIL NIL) (5 5 NIL NIL) (NIL NIL NIL NIL)) for this.