Reuse tidy-select syntax outside of a tidy-select function
     
    
    Usage
    as_vars(tidyselect, data = NULL)
 
    
    Arguments
- tidyselect
- a tidyselect syntax which will be evaluated in context by looking for a call in the call stack that includes a dataframe as the first argument 
- data
- (optional) a specific dataframe with which to evaluate the tidyselect 
 
    
    Value
    a list of symbols resulting from the evaluation of the tidyselect in the context of the current call stack (or a provided data frame)