# Issue 12407: go build -o /dev/null should succeed.
cd ..
go build -o $devnull y
cmp $devnull $WORK/empty.txt

-- x/x_test.go --
package x_test
import (
    "testing"
)
func TestNUL(t *testing.T) {
}
-- y/y.go --
package y
func main() {}