llvm-project/clang/test/Modules/Inputs/string_names/module.map

module "my/module-a" {
  header "a.h"
  use "my/module-c"

  module "Sub" {
    header "sub.h"
  }
}

module "my/module-b" {
  header "b.h"
}

module "my/module-c" {
  header "c.h"
}