st: What is wrong with this syntax?

[Kyle Hood <kyle.hood@yale.edu>]

I have attempting to write a command (in version 8), with the following 
syntax:

program hhk, eclass
syntax varlist(min=3 max=3)[, P(real 0.5)]
di "`1'"
di "`2'"
di "`3'"
...

If I use the following call:

. hhk a b c, p(0.3)

I get an error (when I first try to use variable c), and the program 
displays

a
b
c,

Why is it picking up the comma in the third variable?  It doesn't do that 
for built-in stata commands.

Thanks,
Kyle
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/