The following works for me in 5.16.0: 
($die_on_error ? \&CORE::die : \&CORE::warn)->($error);

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In 5.10.1, though, I am getting

Undefined subroutine &CORE::warn called

[download]

In older versions of Perl, you can still define your own subroutines and reference them (they can even be anonymous): 

($die_on_error ? sub { die shift } : sub { warn shift } )->($error);

[download]

I do not find it more readable than 

die $error if $die_on_error;
warn $error;

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Take reference and then dereference die() and warn() by choroba
in thread Take reference and then dereference die() and warn() by dmitri

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