[Bug c++/103236] New: ICE: in tsubst_pack_expansion, at cp/pt.c:13162

[Bug c++/103236] New: ICE: in tsubst_pack_expansion, at cp/pt.c:13162

[hewillk at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103236

            Bug ID: 103236
           Summary: ICE: in tsubst_pack_expansion, at cp/pt.c:13162
           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: ---

This seems to be an old bug, but I haven't found the dup of which bug it is.
Maybe I have reported a similar one a long time ago, but I'm not sure.

template <class... Ts>
void foo(const Ts&...) {
  ([] {
    [](auto) { }([](auto... x) { x; });
  }(), ...);
}

int main() {
  foo(0);
}

https://godbolt.org/z/Y916oqvje

[Bug c++/103236] ICE: in tsubst_pack_expansion, at cp/pt.c:13162

[hewillk at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103236

--- Comment #1 from 康桓瑋 <hewillk at gmail dot com> ---
may be dup of PR99590.

[Bug c++/103236] [9/10/11/12 Regression] ICE: in tsubst_pack_expansion, at cp/pt.c:13162

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103236

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |9.5
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
      Known to fail|                            |8.1.0
            Summary|ICE: in                     |[9/10/11/12 Regression]
                   |tsubst_pack_expansion, at   |ICE: in
                   |cp/pt.c:13162               |tsubst_pack_expansion, at
                   |                            |cp/pt.c:13162
      Known to work|                            |7.1.0, 7.4.0
   Last reconfirmed|                            |2021-11-14

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
GCC 7.4.0 and before did:
<source>: In lambda function:
<source>:5:35: error: parameter packs not expanded with '...':
     [](auto) { }([](auto... x) { x; });
                                   ^
<source>:5:35: note:         'x'
<source>: In function 'void foo(const Ts& ...)':
<source>:6:4: error: operand of fold expression has no unexpanded parameter
packs
   ([] {
    ~~~~
     [](auto) { }([](auto... x) { x; });
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   }(), ...);
   ~^~

[Bug c++/103236] [9/10/11/12 Regression] ICE: in tsubst_pack_expansion, at cp/pt.c:13162

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103236

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2

[Bug c++/103236] [9/10/11/12/13 Regression] ICE: in tsubst_pack_expansion, at cp/pt.c:13162

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103236

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED
                 CC|                            |mpolacek at gcc dot gnu.org

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed by r12-8258-g65735d21ac4104