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if( $threads ) {
    require threads::shared; threads::shared->import();
    share @foo; # No parens used
}

    use Exception::Spiffy 'catch';
    catch {
        ...
    };

    require Exception::Spiffy; Exception::Spiffy->import('catch');
    &catch( sub {
        ...
    } );

if( $threads ) {
    require threads::shared; threads::shared->import();
    share( \@foo );
}

Type of arg 1 to threads::shared::share must be one of [$@%] (not refe
+rence constructor)

if( $threads ) {
    require threads::shared; threads::shared->import();
    &share( \@foo ); # The ampersand is important
}