[Bug c++/105788] New: ICE: trying to capture 'args#0' in instantiation of generic lambda

[Bug c++/105788] New: ICE: trying to capture 'args#0' in instantiation of generic lambda

[hewillk at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105788

            Bug ID: 105788
           Summary: ICE: trying to capture 'args#0' in instantiation of
                    generic lambda
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

Maybe dup of PR100291, not sure.


#include <ranges>

auto f = [](auto... args) {
  return (std::views::transform(
    [&](auto r) { 
      if constexpr (std::ranges::range<decltype(r)>)
        return std::views::drop(args); })
    | ...);
}(0);

auto g = std::views::single(std::views::iota(0, 5)) | f;

https://godbolt.org/z/PWoeEv5ME

[Bug c++/105788] ICE: trying to capture 'args#0' in instantiation of generic lambda

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105788

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-04-26
           Keywords|ice-on-invalid-code         |ice-on-valid-code
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Reduced:

int n = [](auto... args) {
  return ([&](auto r) {
    if constexpr (sizeof(r))
      return args;
    else
      return 0;
  }(0) + ...);
}(0);