According to the POD, for an array element, delete() sets the element to undef. So $a[0] will be undef. print @a will then give a warning (not error) if warnings are enabled.
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Deleting an array element effectively returns that position of the array to its initial, uninitialized state. Subsequently testing for the same element with exists() will return false. Also, deleting array elements in the middle of an array will not shift the index of the elements after them down. Use splice() for that.
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