llvm-project/clang/test/Modules/Inputs/missing-header-local-visibi.../b.h

#include "a.h"
X b();
When making modules transitively visible, don't take into account whether they have missing header files. Whether a module's headers happen to be present on the local file system should make no difference to whether we make its contents visible when importing another module that re-exports it. If we have an up-to-date AST file that we can load, that's all that matters. This fixes the ability to header syntax checking for modular headers in C++20 mode (or in prior modes where -fmodules-local-submodule-visibility is enabled but -fmodules is not). 2020-04-18 11:25:15 +08:00			`#include "a.h"`
			`X b();`