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public void validate( @Param FunctionCall fn, ContextVariables contextVariables, ValidationErrors errors )
{
    int length = ...; // liczba wierszy pobrana z innego
    for ( int i = 0; i < length; i++ )
    {
        contextVariables.set( "currentRow", i );
        if ( !fn.<Boolean> call() )
        {
            errors.add( "Validation errror" );
        }
    }
}