So when B.pm loads A.pm, it overwrites everything that A.pm already put in the symbol table, and you get your error. Given that you can isolate code that uses A.pm explicitly from that which uses B.pm and success loading B.pm implies A.pm will load successfully, I think the simplest answer is to isolate the blocks of code from each other. For example: 

{
  use B ;
  # do stuff which only requires B
}
{
  use A;
  # do stuff which only requires A
}

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In reply to Re^2: subroutine xyz redefined at ... by kennethk
in thread subroutine xyz redefined at ... by jeanluca

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