C puzzle

[R.L.K.Dattatri]

Here is a small puzzle.
The program below will compile and run on some compilers but will\
not compile on others.

main()
{
	int *p;

	p = (int *) malloc(1024);
	test_it(p);
}
test_it (x)
int (*x)[];
/* If a dimension is specified all compilers will accept it */
{
	int i;

	for (i=0; i < 10; ++i)
		(*x)[i] = i;
	/* x++; */
}

The parameter 'x' in test_it without dimensions works on some compilers
but others complain incomplete array'.
I can understand that the compiler is trying to guess the size of the rows
in the array. But that should come only when the commented x++ is used.
Without the dimension all compilers generated an increment of 'int' size for
'x++' but with the dimension it was the size of dimension * int size.

Does ANSI specify anything in this regard?

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