Output/print without linefeed?

I was running a long program recently, and every now and again I wanted a
little output to indicate how far the program had got.  The "output" command
includes a line feed, which I don't want.  I've tried:

 )set expose add constructor IPRNTPK

but then, for example:

for i in 1..10 repeat iprint(i::String)

produces the output:

1
   >> System error:
   FLUSH is invalid as a function.

Any ideas?

Thanks,
Alasdair

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