Consider using structwalk for listing nested struct fields

[xlab]

You can use FieldList from https://github.com/xlab/structwalk for this kind of stuff: https://github.com/mrmiguu/coco/blob/e51861ba64cb68c40c4abda2cce111872c47fd30/coco.go#L238

We can implement MethodList as well.

P.s. Cool project, ty