[Bug c++/105692] New: internal compiler error: in finish_expr_stmt, at cp/semantics.cc:872

[Bug c++/105692] New: internal compiler error: in finish_expr_stmt, at cp/semantics.cc:872

[elmar.braun at web dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105692

            Bug ID: 105692
           Summary: internal compiler error: in finish_expr_stmt, at
                    cp/semantics.cc:872
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: elmar.braun at web dot de
  Target Milestone: ---

Created attachment 53015
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53015&action=edit
output of compiling with -freport-bug

Reduced testcase:

  template <typename T>
  using lambda = decltype([] {});

  template <typename Lambda>
  void f3() {}

  template <typename T>
  void f2() {
    f3<lambda<T>>();
  }

  void f1() {
    f2<int>();
  }

Compiling this with GCC 12.1.0, using the command line "g++-12.1 -std=c++20
-Wall -Wextra bug.cpp", results in the following error message:

  bug.cpp: In instantiation of ‘void f2() [with T = int]’:
  bug.cpp:13:10:   required from here
  bug.cpp:9:3: internal compiler error: in finish_expr_stmt, at
cp/semantics.cc:872
      9 |   f3<lambda<T>>();

Exact version of GCC, system type, and options given when GCC was configured
can be found in the attached output from -freport-bug.

I was also able to reproduce the issue on godbolt.org
(https://godbolt.org/z/3344WMcWT). Clang 14 and the latest MSVC compile this
code without problems.

[Bug c++/105692] ICE in finish_expr_stmt, at cp/semantics.cc:872 since r9-4045-g0c1e0d63fe0ceabb

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105692

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
            Summary|internal compiler error: in |ICE in finish_expr_stmt, at
                   |finish_expr_stmt, at        |cp/semantics.cc:872 since
                   |cp/semantics.cc:872         |r9-4045-g0c1e0d63fe0ceabb
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-05-23
                 CC|                            |jason at gcc dot gnu.org,
                   |                            |marxin at gcc dot gnu.org

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r9-4045-g0c1e0d63fe0ceabb, was rejected before the revision.

[Bug c++/105692] ICE in finish_expr_stmt, at cp/semantics.cc:872 since r9-4045-g0c1e0d63fe0ceabb

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105692

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED
   Target Milestone|---                         |14.0

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed on the trunk for GCC 14 by the recent lambda template patches.