doubtful assumptions about pointers

[T. William Wells]

Don't ask me why, but 3.2.2.3 does say integral constant
*expression*.

That permits 1 - 1 to be a null pointer constant. And
(char *)(1 - 1) to be a null pointer.

Wierd.

Also, I imagine, it won't help dispel the confusion that seems to
surround null pointers.

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