Thanks everybody pointing out that B is an internal Perl namespace.
Duh! I will refrain from comment on whoever made that choice ...
In addition, I realized that the order in which 'use' and 'use
fields' statements are made is very much significant; if one gets it
wrong, mysterious things happen and no error messages are printed. My
real code (not the snippet I sent) had something like this:
-- AA.pm --
package AA;
...
-- BB.pm --
package BB;
use AA;
use CC;
use base qw( AA );
use fields qw( b1 b2 );
...
-- CC.pm --
package CC;
use BB;
use base qw( BB );
...
My class BB imports CC because under one of its methods creates
instances of CC (which is supposed to be a subclass of BB). But
because I stated
'use CC'
before
'use base'
'use fields'
my file CC.pm would get read before BB was declared to be a child of
AA, and thus would never inherit the fields from AA or BB.
The correct sequence is this:
-- AA.pm --
package AA;
...
-- BB.pm --
package BB;
use AA;
use base qw( AA );
use fields qw( b1 b2 );
use CC; # <- after the 'use base' and 'use fields' statements
...
-- CC.pm --
package CC;
use BB;
use base qw( BB );
...
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