Description of problem:

This is related to bug 982324 and it appears to be a regression.

The testcase from the bug above:
---
#include <functional>

class A {
  typedef std::function<int()> Func;
  Func f_;
public:
  template<class T = Func> A(const T& f = []() { return 0; }) : f_(f) {}
};

int main(int argc, char* argv[]) {
  A a;
}
---

I cannot find anything wrong with it, if I put function pointer or handmade functor instead of lambda as a default parameter, it seems to work.


Version-Release number of selected component (if applicable):
devtoolset-3-gcc-c++-4.9.1-10



Steps to Reproduce:
1.  g++ -g  -std=c++11 test.h


Actual results:
test.h:7:46: error: default argument for template parameter for class enclosing ‘A::<lambda>’
   template<class T = Func> A(const T& f = []() { return 0; }) : f_(f) {}
                                              ^
test.h: In function ‘int main(int, char**)’:
test.h:11:5: error: no matching function for call to ‘A::A()’
   A a;
     ^
test.h:11:5: note: candidates are:
test.h:7:28: note: template<class T> A::A(const T&)
   template<class T = Func> A(const T& f = []() { return 0; }) : f_(f) {}
                            ^
test.h:7:28: note:   template argument deduction/substitution failed:
test.h:11:5: note:   couldn't deduce template parameter ‘T’
   A a;
     ^
test.h:3:7: note: A::A(const A&)
 class A {
       ^
test.h:3:7: note:   candidate expects 1 argument, 0 provided
test.h:3:7: note: A::A(A&&)
test.h:3:7: note:   candidate expects 1 argument, 0 provided


Expected results:
it compiles