env GO111MODULE=off

# Issue 17119: Test more duplicate load errors.
! go build dupload
! stderr 'duplicate load|internal error'
stderr 'dupload/vendor/p must be imported as p'

-- dupload/dupload.go --
package main

import (
	_ "dupload/p2"
	_ "p"
)

func main() {}
-- dupload/p/p.go --
package p
-- dupload/p2/p2.go --
package p2

import _ "dupload/vendor/p"
-- dupload/vendor/p/p.go --
package p