Props doesn't work with arg

[agrover]

Props returns MessageItem, so one can't use dbus::arg::Array and friends, which I thought was recommended over MessageItem these days?

[diwic]

Yep, very true. The problem boils down to limitations in the Rust type system. A property can't be generic over Arg - it has to be a Box<Arg> or something like that, otherwise you can't have more than one type of property in a Tree (which is a non-starter). However, Box<Arg> is impossible because it contains static methods and can therefore not be turned into a trait object.

I experimented with making a trait similar to Arg but taking &self as argument instead of no argument, but never finished it properly.

[diwic]

Hi, I just released v0.4.0 of dbus-rs, which includes a rewrite of the tree module and in the process, it fixes this issue. Enjoy!