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# In GOPATH mode, vendored packages can replace std packages.
env GO111MODULE=off
cd vend/hello
go test -v
stdout TestMsgInternal
stdout TestMsgExternal
# In module mode, they cannot.
env GO111MODULE=on
! go test -mod=vendor
stderr 'undefined: strings.Msg'
-- vend/hello/go.mod --
module vend/hello
go 1.16
-- vend/hello/hello.go --
package main
import (
"fmt"
"strings" // really ../vendor/strings
)
func main() {
fmt.Printf("%s\n", strings.Msg)
}
-- vend/hello/hello_test.go --
package main
import (
"strings" // really ../vendor/strings
"testing"
)
func TestMsgInternal(t *testing.T) {
if strings.Msg != "hello, world" {
t.Fatalf("unexpected msg: %v", strings.Msg)
}
}
-- vend/hello/hellox_test.go --
package main_test
import (
"strings" // really ../vendor/strings
"testing"
)
func TestMsgExternal(t *testing.T) {
if strings.Msg != "hello, world" {
t.Fatalf("unexpected msg: %v", strings.Msg)
}
}
-- vend/vendor/strings/msg.go --
package strings
var Msg = "hello, world"
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