I thought you might want to know that perl 5.9.2 has a core function "err"
from perldoc perlop As more readable alternatives to "&&", "//" and "||" when used for control flow, Perl provides "and", "err" and "or" operators this causes problems such as t/fail-more...............Ambiguous call resolved as CORE::err(), qualify as such or use & at t/fail-more.t line 39. Ambiguous call resolved as CORE::err(), qualify as such or use & at t/fail-more.t line 44. Ambiguous call resolved as CORE::err(), qualify as such or use & at t/fail-more.t line 48.