What version of Go (go version) and dep (git describe --tags) are you using?

go version go1.8.3 windows/amd64
dep v0.1.0-206-ge99676b

What dep command did you run?

dep ensure -v

What did you expect to see?

Normal working of dep ensure :)

What did you see instead?

An error: both d:\Documents\Projects\Go\src\github.com\sas1024\project and D:\Documents\Projects\Go\src\github.com\sas1024\project are in the same GOPATH d:\Documents\Projects\Go

It's very strange, that's hard drive letter case is differs in paths. There is normal letter and capital letter.