module UserA {
    header "user-a.h"
    export *
    requires cplusplus
}

module UserB {
    header "user-b.h"
    export *
    requires cplusplus
}

module UserC {
    header "user-c.h"
    export *
    requires cplusplus
}

module DeclA {
    header "decl-a.h"
    export *
    requires cplusplus
}

module DeclB {
    header "decl-b.h"
    export *
    requires cplusplus
}

module Helper {
    header "helper.h"
    export *
    requires cplusplus
}