[boost] [variant] gcc crash

Subject: [boost] [variant] gcc crash
From: Igor R (boost.lists_at_[hidden])
Date: 2016-12-17 15:57:36

Consider the following snippet (trying to compile with Boost 1.62):

/////////////////////////////////////////////////////////////
#include <boost/variant.hpp>

template<class Node>
struct node1_type;

struct var_type;

using var_base = boost::variant<int,
  boost::recursive_wrapper<node1_type<var_type>>
>;

template<class Node>
struct node1_type
{
 Node child;
};

struct var_type : var_base
{
  using var_base::var_base;
};

int main()
{
  var_type v1 = 1;
}

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

It crashes GCC:
http://melpon.org/wandbox/permlink/A6BuYqqrG4COcfFl

and produces compilation error with any released version of Clang:
http://melpon.org/wandbox/permlink/1JQ7OVLV3crERRJX
(Although it does compile with Clang-4 trunk).

I'd appreciate if Variant maintainers could take a look at it.

Thanks.