[llvm-bugs] [Bug 35832] New: ambiguity accessing anonymous union member present in multiple bases despite explicit qualification

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35832

            Bug ID: 35832
           Summary: ambiguity accessing anonymous union member present in
                    multiple bases despite explicit qualification
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rjmccall at apple.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

harza:/tmp$ cat red.cpp
class B {
protected:
 int i;
 union { int j; };
};

class X : public B { };
class Y : public B { };

class Z : public X, public Y {
 int a() { return X::i; } // works
 int b() { return X::j; } // fails
};
harza:/tmp$ clang red.cpp 
red.cpp:12:22: error: ambiguous conversion from derived class 'Z' to base class
      'B':
    class Z -> class X -> class B
    class Z -> class Y -> class B
 int b() { return X::j; } // fails
                     ^
1 error generated.

Report by Dave Zarzycki!

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