src/cmd/go/testdata/script/vendor_outside_module.txt

# baz.go (importing just fmt) works with -mod=mod,  -mod=vendor.
go build -x -mod=mod my-module/vendor/example.com/another-module/foo/bar/baz.go
go build -x -mod=readonly my-module/vendor/example.com/another-module/foo/bar/baz.go
go build -x -mod=vendor my-module/vendor/example.com/another-module/foo/bar/baz.go

# baz_with_outside_dep.go (with a non-std dependency) works with -mod=mod
# but not with -mod=readonly and -mod=vendor.
go build -x -mod=mod my-module/vendor/example.com/another-module/foo/bar/baz_with_outside_dep.go
! go build -x -mod=readonly my-module/vendor/example.com/another-module/foo/bar/baz_with_outside_dep.go
stderr 'no required module provides package rsc.io/quote'
! go build -x -mod=vendor my-module/vendor/example.com/another-module/foo/bar/baz_with_outside_dep.go
stderr 'no required module provides package rsc.io/quote'

-- my-module/go.mod --
module example.com/my-module

go 1.20
-- my-module/vendor/example.com/another-module/foo/bar/baz.go --
package main

import "fmt"

func main() {
	fmt.Println("hello, world.")
}
-- my-module/vendor/example.com/another-module/foo/bar/baz_with_outside_dep.go --
package main

import (
    "fmt"
    "rsc.io/quote"
)

func main() {
	fmt.Println(quote.Hello())
}