Replace an unreachable error path with an assert

(SourceManager::createFileID cannot return an invalid file ID).
Also update a comment to reflect this.

llvm-svn: 134168

1 files changed, 1 insertions, 4 deletions

diff --git a/clang/lib/Lex/PPDirectives.cpp b/clang/lib/Lex/PPDirectives.cpp
index b6925b70b70..f74aad3c816 100644
--- a/clang/lib/Lex/PPDirectives.cpp
+++ b/clang/lib/Lex/PPDirectives.cpp
@@ -1208,10 +1208,7 @@ void Preprocessor::HandleIncludeDirective(SourceLocation HashLoc,
   // Look up the file, create a File ID for it.
   FileID FID = SourceMgr.createFileID(File, FilenameTok.getLocation(),
                                       FileCharacter);
-  if (FID.isInvalid()) {
-    Diag(FilenameTok, diag::err_pp_file_not_found) << Filename;
-    return;
-  }
+  assert(!FID.isInvalid() && "Expected valid file ID");
 
   // Finally, if all is good, enter the new file!
   EnterSourceFile(FID, CurDir, FilenameTok.getLocation());