[Bug c++/118245] New: internal compiler error: in convert_nontype_argument, at cp/pt.cc:7881 WHEN use lambda AS template-arg

[terryinzaghi at 163 dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118245

            Bug ID: 118245
           Summary: internal compiler error: in convert_nontype_argument,
                    at cp/pt.cc:7881  WHEN  use lambda AS template-arg
           Product: gcc
           Version: 14.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: terryinzaghi at 163 dot com
  Target Milestone: ---

/*using  gcc 14.2 */
/*sample code will trigger the error: */


template<typename Task,auto name> struct Cask {
    Cask()  {  std::cout<< name() << " start" << std::endl                  ;}
    ~Cask() { (*std::launder(reinterpret_cast<Task*>(this)))(name());}
};
struct Task {
   struct T0 : Cask<Task, ([]{return("t0");})>        {
      static constexpr auto Any_Thing_End_With_Block_Just_Hold_The_First_Line =
[]{};
      //--- without this line:   internal compiler error: in
convert_nontype_argument, at cp/pt.cc:7881
      //--- 0x9387ae lookup_template_class(tree_node*, tree_node*, tree_node*,
tree_node*, int, int)
      Cask<Task, ([]{return("c00");}) > c00{};
      Cask<Task, ([]{return("c01");}) > c01{};
   } t0;
   struct T1 : Cask<Task,([]{return("t1");})>         {
      Cask<Task, ([]{return("c10");})> c10{};
      Cask<Task, ([]{return("c11");})> c11{};
   } t1;
   void operator()(const char* msg) {std::cout<< "top received "<< msg <<
std::endl;}
};

/* it Maybe  Same as  101430 */
/* it NOT happend IF using gcc 13.x*/