Not as great as a full IDE, but Atom.io + tokamak(https://vertexclique.github.io/tokamak https://vertexclique.github.io/tokamak) + atom-ctags(https://atom.io/pa

Not as great as a full IDE, but Atom.io + tokamak(https://vertexclique.github.io/tokamak https://vertexclique.github.io/tokamak) + atom-ctags(https://atom.io/packages/atom-ctags https://atom.io/packages/atom-ctags) get you a decent editor/light IDE setup. I agree however that it would be nice to have ie lifetimes visualized and stuff like that, hopefully sometime soon...