[LLVMbugs] [Bug 18685] New: weird typo correction to member of class template specialization

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18685

            Bug ID: 18685
           Summary: weird typo correction to member of class template
                    specialization
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: llvmbugs at cs.uiuc.edu, rikka at google.com
    Classification: Unclassified

Try adding a use of llvm::BitVector to include/clang/Lex/Preprocessor.h. See
something like this:

include/clang/Lex/Preprocessor.h:458:7: error: no type named 'BitVector' in
namespace 'llvm'; did you mean 'llvm::SmallSetVector<const FileEntry *,
2>::SetVector'?
      llvm::BitVector Map;
      ^~~~~~~~~~~~~~~
      llvm::SmallSetVector<const FileEntry *, 2>::SetVector

That's a surprising correction!

It seems really weird that Clang has guessed not only an (incorrect) typo
correction, but also guessed some template arguments (though I can see how we'd
have done this)!

(More generally, correcting both the name and adding a missing
nested-name-specifier seems like a really-low-confidence correction, and not
one that we should be giving a fix-it for, nor using in error recovery.)

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