[llvm-bugs] [Bug 31976] New: invalid application of 'sizeof' to an incomplete type 'B<typename std::decay<int>::type>' (aka 'B<int>')

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=31976

            Bug ID: 31976
           Summary: invalid application of 'sizeof' to an incomplete type
                    'B<typename std::decay<int>::type>' (aka 'B<int>')
           Product: clang
           Version: 3.9
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ajneu1 at gmail.com
                CC: llvm-bugs at lists.llvm.org

The following code, when compiled with
clang++-3.9 -std=c++14 -o go main.cpp

gives this error:
error: invalid application of 'sizeof' to an incomplete type 'B<typename
std::decay<int>::type>' (aka 'B<int>')

See http://melpon.org/wandbox/permlink/vMiEuyYyKk9Ya4aX

But it works find with gcc: http://melpon.org/wandbox/permlink/xmSu58FRGFTm84RW

///////////////////////////////////////////////
#include <iostream>

template <typename T1>
struct A {


  template <typename T2>
  struct B {
  public:
    static const std::size_t Size = (sizeof(B<typename std::decay<T2>::type>));

    /*
      // workaround
    static constexpr std::size_t Size() {
      return (sizeof(B<typename std::decay<T2>::type>));
    }
    */

  private:
    T2 t_;
  };


};



int main()
{
  std::cout << A<int>::B<int>::Size << std::endl;

  return 0;
}

///////////////////////////////////////////////

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