[llvm-bugs] [Bug 26893] New: sizeof non-static member of struct nested within class template (-std=c++11)

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https://llvm.org/bugs/show_bug.cgi?id=26893

            Bug ID: 26893
           Summary: sizeof non-static member of struct nested within class
                    template (-std=c++11)
           Product: clang
           Version: 3.6
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bobmoretti at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

In clang/llvm 3.6.2, the following code results in a compilation error when
compiling with std=c++11:

template <typename T=void>
class bar
{
public:
    struct foo
    {
        int array[10];
    };

    int baz()
    {
        return sizeof(foo::array);
    }
};

int main(void)
{
    bar<> b;
    return b.baz();
}

The same code compiles cleanly if I make bar a simple class and not a template.

Stack overflow user ecatmur also posted a reduced example:

template<class T> struct M { int f() { return sizeof(T::x); } };
struct S { int x; };
int main() { return M<S>{}.f(); }

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