Function declarative_dataflow::collect_dependencies

pub fn collect_dependencies<T, I>(
    context: &I, 
    names: &[&str]
) -> Result<Vec<Rule>, Error> where
    T: Timestamp + Lattice + TotalOrder,
    I: ImplContext<T>, 

Returns a deduplicates list of all rules used in the definition of the specified names. Includes the specified names.