{
        no strict 'refs';
        
        # We don't want to introduce another scope, as that will
        # negate the effect of the local:
        NEXT:
            my $n = shift @handlers;
            local *{$n} = $handler{ $n };
            goto NEXT
                if @handlers;

        $ok = eval $cfg_str;
        $err = $@;
    }
[download]

The code is inside a loop (yes it is) so there is no need to use goto:

    NEXT: {
        no strict 'refs';
        
        # We don't want to introduce another scope, as that will
        # negate the effect of the local:
            my $n = shift @handlers;
            local *{$n} = $handler{ $n };
            redo NEXT
                if @handlers;

        $ok = eval $cfg_str;
        $err = $@;
    }
[download]

Or perhaps:

    {
        no strict 'refs';
        
        # We don't want to introduce another scope, as that will
        # negate the effect of the local:
        NEXT: {
            my $n = shift @handlers;
            local *{$n} = $handler{ $n };
            redo NEXT
                if @handlers;
        }
        $ok = eval $cfg_str;
        $err = $@;
    }
[download]

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