[Bug c++/57820] New: Can't initialize a constexpr object with inline initialization

[liweifriends at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57820

            Bug ID: 57820
           Summary: Can't initialize a constexpr object with inline
                    initialization
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: liweifriends at gmail dot com

the source code:

struct C
{
    int a = 2;
    int b = a + 1;
};

C c;  //OK
constexpr C d; //error

int main()
{
}

Why I can't initialize d?