That's it: an infinitely looping foreach isn't a foreach.
It's not a foreach in perl.
It's not a for-each in standart scheme either, as
r5rs clearly says that the arguments to for-each are lists.
(In some interpreters, you can give an infinite list to
for-each, but that's clearly an extension. Others, like
mzscheme, raise an error on an infinite list.)
For in sh and foreach in csh won't allow you to loop
infinitely (except for the new arithmetic for loop in bash,
but that's not a foreach loop, it's rather a c-style for
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