[modules] Allow frameworks to have only a private module without a public one.
Support only preferred spelling 'Modules/module.private.modulemap' and
not the deprecated 'module_private.map'.
rdar://problem/57715533
Reviewed By: bruno
Differential Revision: https://reviews.llvm.org/D75311
diff --git a/clang/test/Modules/implicit-private-without-public.m b/clang/test/Modules/implicit-private-without-public.m
new file mode 100644
index 0000000..e4920bc
--- /dev/null
+++ b/clang/test/Modules/implicit-private-without-public.m
@@ -0,0 +1,11 @@
+// REQUIRES: shell
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -fimplicit-module-maps -fmodules-cache-path=%t \
+// RUN: -F%S/Inputs/implicit-private-without-public \
+// RUN: -fsyntax-only %s -verify
+
+@import Foo_Private;
+
+// Private module map without a public one isn't supported for deprecated module map locations.
+@import DeprecatedModuleMapLocation_Private;
+// expected-error@-1{{module 'DeprecatedModuleMapLocation_Private' not found}}