[Bug c++/79031] New: [C++17] ICE with class template deduction for std::vector and std::initializer_list

[g++bug at oxyware dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79031

            Bug ID: 79031
           Summary: [C++17] ICE with class template deduction for
                    std::vector and std::initializer_list
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: g++bug at oxyware dot com
  Target Milestone: ---

#include <vector>

int main()
{
  std::vector v({4});
}

//g++ 7.0.0 20170108 (experimental) 

Compilation with g++ version "7.0.0 20170108 (experimental)" and -std=c++1z
fails with:

<source>: In function 'std::vector(std::initializer_list<_Tp>, const
allocator_type&)-> std::vector<_Tp, _Alloc> [with _Tp = int; _Alloc =
std::allocator<int>; std::vector<_Tp, _Alloc>::allocator_type =
std::allocator<int>]':
<source>:5:20: internal compiler error: in tsubst_copy, at cp/pt.c:14953
std::vector v({4});
^
mmap: Cannot allocate memory
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
Compiler exited with result code 1

This compiles successfully with std::vector<int> v({4}); but not when
attempting to deduce the initializer_list type.

Possibly related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78894