/usr/share/gocode/src/ is in golang-golang-x-exp-dev 0.0~git20150826.1.eb7c1fa-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gocode/src/golang.org/
/usr/share/gocode/src/golang.org/x/
/usr/share/gocode/src/golang.org/x/exp/
/usr/share/gocode/src/golang.org/x/exp/ebnf/
/usr/share/gocode/src/golang.org/x/exp/ebnf/ebnf.go
/usr/share/gocode/src/golang.org/x/exp/ebnf/ebnf_test.go
/usr/share/gocode/src/golang.org/x/exp/ebnf/parser.go
/usr/share/gocode/src/golang.org/x/exp/inotify/
/usr/share/gocode/src/golang.org/x/exp/inotify/inotify_linux.go
/usr/share/gocode/src/golang.org/x/exp/inotify/inotify_linux_test.go
/usr/share/gocode/src/golang.org/x/exp/mmap/
/usr/share/gocode/src/golang.org/x/exp/mmap/manual_test_program.go
/usr/share/gocode/src/golang.org/x/exp/mmap/mmap_linux.go
/usr/share/gocode/src/golang.org/x/exp/mmap/mmap_other.go
/usr/share/gocode/src/golang.org/x/exp/mmap/mmap_test.go
/usr/share/gocode/src/golang.org/x/exp/old/
/usr/share/gocode/src/golang.org/x/exp/old/netchan/
/usr/share/gocode/src/golang.org/x/exp/old/netchan/common.go
/usr/share/gocode/src/golang.org/x/exp/old/netchan/export.go
/usr/share/gocode/src/golang.org/x/exp/old/netchan/import.go
/usr/share/gocode/src/golang.org/x/exp/old/netchan/netchan_test.go
/usr/share/gocode/src/golang.org/x/exp/utf8string/
/usr/share/gocode/src/golang.org/x/exp/utf8string/string.go
/usr/share/gocode/src/golang.org/x/exp/utf8string/string_test.go
/usr/share/gocode/src/golang.org/x/exp/winfsnotify/
/usr/share/gocode/src/golang.org/x/exp/winfsnotify/winfsnotify.go
/usr/share/gocode/src/golang.org/x/exp/winfsnotify/winfsnotify_test.go