The package golang-golang-x-tools 1:0.0~git20180222.0.f8f2f88+ds-1 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/golang-golang-x-tools -- More information about golang-golang-x-tools: http://pkg.kali.org/pkg/golang-golang-x-tools
