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$ perl -Mlib=. -MMod -e'Mod::foo();' Insufficient arguments at Mod.pm line 5. # carp Insufficient arguments at -e line 1. # warn
$ PERL5OPT=-MCarp::Always perl -Mlib=. -MMod -e'Mod::foo();' Insufficient arguments at Mod.pm line 5. ... Insufficient arguments at Mod.pm line 6. Mod::foo() called at Mod.pm line 6. Mod::foo() called at -e line 1