# perl -e 'use My::Module::Account qw(_GenerateAccountSummary); _GenerateAccountSummary();' Undefined subroutine &main::_GenerateAccountSummary called at -e line 1. #### perl -wle'use My::Module::Account qw(_GenerateAccountSummary); print My::Module::Account->can("import") || "no"' #### perl -wle'use My::Module::Account qw(_GenerateAccountSummary); print *{$::{_GenerateAccountSummary}}{CODE} || "no"' #### perl -wle'use My::Module::Account qw(_GenerateAccountSummary); print defined(&_GenerateAccountSummary) ? "yes" : "no"'