clang/test/Modules/Inputs/submodules-merge-defs/module.modulemap

module "stuff" {
  textual header "defs.h"
  module "empty" { header "empty.h" }
  module "use" { header "use-defs.h" }
}

module "redef" {
  header "import-and-redefine.h"
  // Do not re-export stuff.use
  use "stuff"
}