As other have said: it can be solved in the library by defining a string type with the appropriate semantics (e.g. the MaybeOwned[1] type they refer to). [1]:

As other have said: it can be solved in the library by defining a string type with the appropriate semantics (e.g. the MaybeOwned[1] type they refer to). [1]: http://static.rust-lang.org/doc/master/std/str/enum.MaybeOwned.html http://static.rust-lang.org/doc/master/std/str/enum.MaybeOwn...