This test verifies that we can load multiple orphaned files as
command-line-arguments packages.

Previously, we would load only one because go/packages returns at most one
command-line-arguments package per query.

-- a/main.go --
package main

func main() {
	var a int //@diag(re"var (a)", re"not used")
}
-- b/main.go --
package main

func main() {
	var b int //@diag(re"var (b)", re"not used")
}
-- c/go.mod --
module c.com // The existence of this module avoids a workspace error.

go 1.18
