/usr/share/gocode/src/code.google.com/p/go.crypto is in golang-golang-x-crypto-dev 1:0.0~git20170629.0.5ef0053-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/gocode/src/code.google.com/p/../../golang.org/x/crypto