[LLVMbugs] [Bug 14482] New: "using declaration requires a qualified name" diag should have a fixit to insert the right qualifier if it's unique

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14482

             Bug #: 14482
           Summary: "using declaration requires a qualified name" diag
                    should have a fixit to insert the right qualifier if
                    it's unique
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nicolasweber at gmx.de
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


$ cat test.cc
class A {
 protected:
  void f() {}
};

class B : public A {
 public:
  using f;
};

int main() {
  B b;
  b.f();
}
$ clang -c test.cc
test.cc:8:9: error: using declaration requires a qualified name
  using f;
        ^
test.cc:13:5: error: 'f' is a protected member of 'A'
  b.f();
    ^
test.cc:3:8: note: declared protected here
  void f() {}
       ^
2 errors generated.

SemaDeclCXX's BuildUsingDeclaration() already does a lookup after emitting
err_using_requires_qualname. It could do the lookup first, and suggest
inserting the right prefix if the lookup is isSingleResult().

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