eval "require './data_to_import.dat'" if -f './data_to_import.dat';
$self->{imported_data} = $foo_name_space::data unless $@;

##</code><code>##

{ local *foo_name_spane::data;  eval "require './data_to_import.dat'";  $self->{imported_data} = $foo_name_space::data unless $@; }