Another godef or maybe gogetdoc.
go get -u github.com/JohnWall2016/gogetdef
For emacs
cp gogetdef/emacs/gogetdef.el ~/.emacs.d/
Add the line below to ~/.emacs
(require 'gogetdef "~/.emacs.d/gogetdef.el")
Restart emacs and open a go code file
M-x gogetdef-describe
M-x gogetdef-jump
M-x gogetdef-all