CodaFi added a comment. Figured it out for myself. The test is forming paths that are using non-canonical path separators. Naively using those as keys means that the subsequent canonicalization done by the ASTWriter renders the keys useless for lookups into these structures. I'm going to switch to `FileEntry::tryGetRealPathName` since it's quite literally what ASTWriter is doing as part of its canonicalization phase. I worry about that as a solution in general though. In the future, it would be great to expose the canonicalization utilities in the ASTWriter as a more general kind of facility that could be shared between the implementations so we don't desync things again.
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