kw::Empty is the name of the empty Symbol. It's used a lot. Most places it's used, it's hard to tell if it means "empty symbol" or "no symbol". I.e. it more or less reinvents the null pointer, something that Rust was supposed to get rid of.
I think a lot of the uses could be removed by using Option<Symbol> instead of Symbol, making the "no symbol" cases much clearer.
kw::Emptyis the name of the emptySymbol. It's used a lot. Most places it's used, it's hard to tell if it means "empty symbol" or "no symbol". I.e. it more or less reinvents the null pointer, something that Rust was supposed to get rid of.I think a lot of the uses could be removed by using
Option<Symbol>instead ofSymbol, making the "no symbol" cases much clearer.