[Bug c++/100035] New: Parameter packs not expanded with local variable in lambda

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100035

            Bug ID: 100035
           Summary: Parameter packs not expanded with local variable in
                    lambda
           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: ---

https://godbolt.org/z/ss9bjYvc1

template <class... Ts>
auto f(Ts...) {
  ([] { Ts x = 0; }, ...);
}

gcc rejects with:

<source>: In function 'auto f(Ts ...)':
<source>:3:4: error: operand of fold expression has no unexpanded parameter
packs
    3 |   ([] { Ts x = 0; }, ...);
      |    ^~~~~~~~~~~~~~~~