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From: "soropi8907 at remail7 dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95888] New: Regression in 9.3. GCC freezes when compiling
 code using boost::poly_collection::segment
Date: Thu, 25 Jun 2020 07:03:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95888

            Bug ID: 95888
           Summary: Regression in 9.3. GCC freezes when compiling code
                    using boost::poly_collection::segment
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: soropi8907 at remail7 dot com
  Target Milestone: ---

Version 9.3 and later. 9.2 compiles OK.=20


#include <boost/poly_collection/base_collection.hpp>

struct base{};

int main()
{
  const boost::base_collection<base> n;

#define EXPOSE_BUG 1
#if EXPOSE_BUG
  n.segment<base>().begin();
#else
  n.segment<base,nullptr>().begin();
#endif
}

https://godbolt.org/z/_yau99=