GOPATH project compile failed because of GOROOT's vendor

[lunny]

What version of Go are you using (go version)?

go1.13

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GOARCH="amd64"

GOBIN=""

GOEXE=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="darwin"

GOOS="darwin"

What did you do?

set the project as a gopath root and then

GOPATH=pwd go build

What did you expect to see?

Compile succeed

What did you see instead?

We have used a package on golang.org/x/text and vendor it on our projects. We set our project as a GOPATH. Then when we compile it, it will fail and return the error.

I think this is caused by goroot/src/vendor which added on go1.13. We can find golang.org/x/ packages on that. When compiling, go will find that vendor at first but not the vendor on gopath.

12:2: use of vendored package not allowed

[bronze1man]

Looks like #34068

[lunny]

@bronze1man Thanks! duplicated with #34068.