[Bug c++/98752] New: wrong "error: ‘this’ is not a constant expression" with consteval constructor

[sbergman at redhat dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98752

            Bug ID: 98752
           Summary: wrong "error: ‘this’ is not a constant expression"
                    with consteval constructor
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sbergman at redhat dot com
  Target Milestone: ---

At least with gcc-c++-10.2.1-9.fc33.x86_64 and with a local GCC 11 trunk build:

> $ cat test.cc
> struct S1 { consteval S1(int) {} };
> struct S2 {
>   S1 x;
>   S2(): x(0) {}
> };

> $ g++ -std=c++20 -fsyntax-only test.cc
> test.cc: In constructor ‘S2::S2()’:
> test.cc:4:12: error: ‘this’ is not a constant expression
>     4 |   S2(): x(0) {}
>       |            ^