Doubt on rule 13.2

[roberto]

One of the examples given for rule 13.2 is:

Code:

if ( y ) /* Not compliant, unless y is effectively Boolean data
                              (e.g. a flag) */

Would it still be not compliant if y is of pointer type?
In case it is compliant, should 13.2 be interpreted as to be applicable only to expressions of integral type?