Trailing return type for reference

Consider the following code.

#include <iostream>

class A
{

public:
using T = float;
     A(const T& x)
    {
        m_value = x;
    }

    T& value();

private:
    T m_value;

};

// A::T& A::value() 
//  {
//      return m_value;
//  } 

    auto& A::value()->T &
    {
        return m_value;
    }


int main()
{
    A a(10.0);
    std::cout<<a.value()<<std::endl;


    return 0;
}

When compile using C++11, I get the following error.

error: ‘value’ function with trailing return type has ‘auto&’ as its type rather than plain ‘auto’
   auto& A::value()->T &
                       ^

The equivalent code (the commented function) is working fine. But I would like to use trailing return type.