shift() function folds with hidden constant count, but not with constant!

Bugzilla Link	1081
Created on	May 14, 2013 14:42
Version	svn
OS	Linux
Architecture	PC
Attachments	shifttest.sac

Extended Description

This is weird:
I have a hand-rolled version of the stdlib shift() function, 
which will AWLF if I give it a hidden constant count, eg. id( 5),
but not if I give it a constant - 5.
I'm looking into it now.
sac2c -V
sac2c v1.00-beta (Haggis And Apple)
 product rev 18145 linux-gnu_x86_64
 (Tue May 14 09:34:10 EDT 2013 by sac)
sac2c -doawlf -nowlf shifttest.sac -bopt >crud
Also, the non-constant version ends up with two partitions,
and the constant version has three!