--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/Modules/outofdate-rebuild.m	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,15 @@
+// RUN: rm -rf %t.cache
+// RUN: echo "@import CoreText;" > %t.m
+// RUN: %clang_cc1 -fdisable-module-hash -fmodules-cache-path=%t.cache \
+// RUN:   -fmodules -fimplicit-module-maps -I%S/Inputs/outofdate-rebuild %s \
+// RUN:   -fsyntax-only
+// RUN: %clang_cc1 -DMISMATCH -Werror -fdisable-module-hash \
+// RUN:   -fmodules-cache-path=%t.cache -fmodules -fimplicit-module-maps \
+// RUN:   -I%S/Inputs/outofdate-rebuild %t.m -fsyntax-only
+// RUN: %clang_cc1 -fdisable-module-hash -fmodules-cache-path=%t.cache \
+// RUN:   -fmodules -fimplicit-module-maps -I%S/Inputs/outofdate-rebuild %s \
+// RUN:   -fsyntax-only
+
+// This testcase reproduces a use-after-free in when ModuleManager removes an
+// entry from the ModuleCache without notifying its parent ASTReader.
+@import Cocoa;