Dep installation fails on Go version 1.7.x

[HaraldNordgren]

What dep command did you run?

$ docker run golang:1.7 bash -c 'go get -v github.com/golang/dep/cmd/dep'
github.com/golang/dep (download)
github.com/golang/dep/vendor/github.com/Masterminds/semver
github.com/golang/dep/vendor/github.com/Masterminds/vcs
github.com/golang/dep/vendor/github.com/armon/go-radix
github.com/golang/dep/vendor/github.com/boltdb/bolt
github.com/golang/dep/vendor/github.com/golang/protobuf/proto
github.com/golang/dep/gps/paths
github.com/golang/dep/gps/pkgtree
github.com/golang/dep/vendor/github.com/pkg/errors
github.com/golang/dep/internal/fs
github.com/golang/dep/vendor/github.com/jmank88/nuts
github.com/golang/dep/vendor/github.com/nightlyone/lockfile
github.com/golang/dep/vendor/github.com/sdboyer/constext
github.com/golang/dep/vendor/golang.org/x/net/context
github.com/golang/dep/vendor/golang.org/x/sync/errgroup
github.com/golang/dep/gps/internal/pb
github.com/golang/dep/vendor/github.com/pelletier/go-toml
github.com/golang/dep/gps
# github.com/golang/dep/gps
src/github.com/golang/dep/gps/constraint.go:378: undefined: sort.SliceStable
src/github.com/golang/dep/gps/lock.go:31: undefined: sort.SliceIsSorted
src/github.com/golang/dep/gps/lock.go:38: undefined: sort.Slice
github.com/golang/dep/vendor/gopkg.in/yaml.v2

The command works on later Go images.

[HaraldNordgren]

I realized now that when installing dep on Travis it's probably better to call

curl https://github.com/raw/golang/dep/master/install.sh | sh

which works independently of your Go version. Closing this one.