[llvm-bugs] [Bug 24904] New: clang cannot instantiate non-type template argument with static constexpr member function called via this->

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24904

            Bug ID: 24904
           Summary: clang cannot instantiate non-type template argument
                    with static constexpr member function called via
                    this->
           Product: clang
           Version: 3.7
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: fmatthew5876 at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

template <int A> int a() { return 1; }

class B {
  static constexpr int b() { return 2; }
  int a1() { return a<B::b()>(); }
  int a2() { return a<this->b()>(); }
};

The above compiles in gcc but clang fails with the following error:

note: candidate template ignored: invalid explicitly-specified argument for
template parameter 'A'

The problem is in B::a2(). Clang doesn't like this->b() being used for template
parameter A. clang has no problem with using B::b() as seen in B::a1().

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