[llvm-bugs] [Bug 37842] New: Partial ordering of non-type template parameters with dependent types

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37842

            Bug ID: 37842
           Summary: Partial ordering of non-type template parameters with
                    dependent types
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zhonghao at pku.org.cn
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

The code is as follow:

template <class T>
struct identity
{
 typedef T type;
};

template <class T, typename T::type A>
struct foo {};

template <class T, T A>
struct foo<identity<T>, A> {};

int main()
{
 foo<identity<int>,0> bar; // error here
}

clang++ accepts the code, but g++ rejects it with error messages. Initially, I
believe that this is a bug in g++, and reported the problem
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86193

However, the programmers of g++ believe that they are correct, and clang++
shall not accept the code. Would you please check this problem, and fix it if
it is really a bug in clang?

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