module M {
module A { header "a.h" export * }
module B { header "b.h" export * }
module X { header "x.h" header "missing.h" export * }
module All { header "all.h" export * }
}
module M {
module A { header "a.h" export * }
module B { header "b.h" export * }
module X { header "x.h" header "missing.h" export * }
module All { header "all.h" export * }
}