As steveklabnik says, it absolutely is about tradeoffs. The anymap crate may provide enough of "generic container types" to be useful, and can avoid a lot of re

As steveklabnik says, it absolutely is about tradeoffs. The anymap crate may provide enough of "generic container types" to be useful, and can avoid a lot of repetition of per-type code. A graph with heterogeneous node types is definitely possible, Box<Any> is one solution and there are others.