Is it possible for two modules to use each other?

I'm trying to do something like this:

#a.pl
use bspace;
use cspace;
bgo();
cgo();

#bspace.pm
package bspace;
use Exporter;
use cspace;
@ISA='Exporter';
@EXPORT=qw( bgo bhelp );
sub bgo { chelp(); }
sub bhelp { print "bhelp\n"; }
1;

#cspace.pm
package cspace;
use Exporter;
use bspace;
@ISA='Exporter';
@EXPORT=qw( cgo chelp );
sub cgo { bhelp(); }
sub chelp { print "chelp\n"; }
1;
[download]

Running a.pl results in the following output:

chelp
Undefined subroutine &cspace::bhelp called at cspace.pm line 8.
[download]

Is there some trick to making this work as expected, or can you just not go in circles like this?

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