[Bug c++/99584] New: ICE Segmentation fault when expanding lambda noexcept specifier with invalid parameter pack

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99584

            Bug ID: 99584
           Summary: ICE Segmentation fault when expanding lambda noexcept
                    specifier with invalid parameter pack
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

This may be related/duplicated to PR 99513 or PR 99583, but I am not sure.

The following invalid code triggers ICE in gcc-trunk:


void f(...);

template <typename... Args> 
void g(Args... args) {  
 f([](Args) noexcept(args) {} ...);  
}

int main() { g(0); }

(godbolt: https://gcc.godbolt.org/z/477Mn8)
(wandbox: https://wandbox.org/permlink/qA74qnIHdaZSX6JF)