================
@@ -5834,9 +5834,13 @@ bool ASTReader::readASTFileControlBlock(
           break;
         case INPUT_FILE:
           bool Overridden = static_cast<bool>(Record[3]);
+          size_t FilenameLen = ModuleDir.size() + Record[7] + 1;
           auto Filename = ResolveImportedPath(PathBuf, Blob, ModuleDir);
+          StringRef FilenameAsRequested = Filename->substr(0, FilenameLen);
+          StringRef ExternalFilename = Filename->substr(FilenameLen);
----------------
jansvoboda11 wrote:

Can you explain how this is supposed to work? IIRC `Blob` is the concatenation 
of the as-requested name and the name, so this doesn't make sense to me. (To be 
frank, even the original code seems incorrect.)

https://github.com/llvm/llvm-project/pull/132237
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