Newbie - having difficulty with a macro

John Christopher <[email protected]>
Newsgroups gmane.comp.gnu.m4.general
Message-ID <[email protected]>
I am using m4 1.4.12 on Ubuntu Linux.

$ cat m4test.txt
m4_define(`MACRO1', `%d foo, bar %d')
m4_format(MACRO1, `3', `2')

$ m4 -P m4test.txt
0 foo

$

I was expecting the output to be:
3 foo, bar 2

What am I doing wrong?
Thank you.
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