Then you'll need to wrap the calls in anonymous subs: 

my $calls = {
    A => sub{ print_A( \%config_A ); },
    B => sub{ print_B( \%config_B ); },
};

my $test = 'A';
$calls->{$test}();

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In reply to Re^3: How to conditionally execute a subroutine defined as hash value by BrowserUk
in thread How to conditionally execute a subroutine defined as hash value by Anonymous Monk

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