[PATCH] D49518: [VFS] Emit an error when a file isn't located in any directory.

[Volodymyr Sapsai via Phabricator via cfe-commits]

vsapsai updated this revision to Diff 157311.
vsapsai added a comment.

- Make diagnostics more general, use unit tests.


https://reviews.llvm.org/D49518

Files:
  clang/lib/Basic/VirtualFileSystem.cpp
  clang/unittests/Basic/VirtualFileSystemTest.cpp

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