The segfault is due to the Lisp implementation (namely GCL) incorrectly handling the attempt to allocate an array which is too large for available memory. The behavior shown in the 49 by 49 case is correct: if the array can't be allocated, the Lisp implementation should print an error message. Crashing with a segmentation fault, as in the 50 by 50 case, is incorrect behavior.
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