"C" compiler where 0 is not of type int?

This is going to sound like an odd question, because it is.

I saw this code fragment in an answer posted on Quora:

    // In case literal 0 isn't an int on this platform.
    int z = (int) 0;

The writer encountered this in an old C project, and suggested that the
author of the code might have had a legitimate concern.  (He ended up
removing the cast.)

Obviously 0 is of type int in every C standard.  If the cast were
necessary, it would be because of a non-conforming compiler.

I've heard of non-conforming C compilers that make int 8 bits, or that
don't have long double, or that have a long double type that doesn't
meet the standard's range and/or precision requirements.

My question is this: Has there ever been a (non-conforming) C compiler
that gave a constant 0 a type other than int?

(I'm ignoring the use of a "//" comment; the writer may not have copied
the code verbatim.)

--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */