/usr/share/gocode/src/golang.org/x/crypto/acme/ is in golang-golang-x-crypto-dev 1:0.0~git20170629.0.5ef0053-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gocode/src/golang.org/x/crypto/acme/acme.go
/usr/share/gocode/src/golang.org/x/crypto/acme/acme_test.go
/usr/share/gocode/src/golang.org/x/crypto/acme/autocert/
/usr/share/gocode/src/golang.org/x/crypto/acme/autocert/autocert.go
/usr/share/gocode/src/golang.org/x/crypto/acme/autocert/autocert_test.go
/usr/share/gocode/src/golang.org/x/crypto/acme/autocert/cache.go
/usr/share/gocode/src/golang.org/x/crypto/acme/autocert/cache_test.go
/usr/share/gocode/src/golang.org/x/crypto/acme/autocert/example_test.go
/usr/share/gocode/src/golang.org/x/crypto/acme/autocert/listener.go
/usr/share/gocode/src/golang.org/x/crypto/acme/autocert/renewal.go
/usr/share/gocode/src/golang.org/x/crypto/acme/autocert/renewal_test.go
/usr/share/gocode/src/golang.org/x/crypto/acme/jws.go
/usr/share/gocode/src/golang.org/x/crypto/acme/jws_test.go
/usr/share/gocode/src/golang.org/x/crypto/acme/types.go
/usr/share/gocode/src/golang.org/x/crypto/acme/types_test.go