src/pl/plperl/sql/plperl_init.sql

-- test plperl.on_plperl_init errors are fatal

-- Avoid need for custom_variable_classes = 'plperl'
LOAD 'plperl';

SET SESSION plperl.on_plperl_init = ' system("/nonesuch") ';

SHOW plperl.on_plperl_init;