[Bug c++/67369] New: [5/6 Regression] ICE (in tsubst_decl, at cp/pt.c:11302) with -std=c++14

["doko at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67369

            Bug ID: 67369
           Summary: [5/6 Regression] ICE (in tsubst_decl, at
                    cp/pt.c:11302) with -std=c++14
           Product: gcc
           Version: 5.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at gcc dot gnu.org
  Target Milestone: ---

seen with the gcc-5-branch r227166, and trunk r227171

$ cat foo.cc 
int main() {
  unsigned const nsz = 0;
  auto repeat_conditional = [&](auto) {
    auto new_sz = nsz;
  };
  repeat_conditional(1);
}
$ /usr/lib/gcc-snapshot/bin/g++ -std=c++14 -c foo.cc 
foo.cc: In instantiation of 'main()::<lambda(auto:1)> [with auto:1 = int]':
foo.cc:6:23:   required from here
foo.cc:1:5: internal compiler error: in tsubst_decl, at cp/pt.c:11302
 int main() {
     ^
Please submit a full bug report,
with preprocessed source if appropriate.