https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98752
--- Comment #6 from Stephan Bergmann <sberg.fun at gmail dot com> ---
While the original reproducer from comment 0 appears to be fixed in recent GCC
14 trunk, a slight modification still fails at least with recent GCC 14 trunk:
> $ cat test.cc
> struct S1 {
> int a;
> consteval S1(int n): a(n) {}
> };
> struct S2 {
> S1 x;
> S2(): x(0) {}
> };
> $ g++ -fsyntax-only -std=c++20 test.cc
> test.cc: In constructor ‘S2::S2()’:
> test.cc:7:11: error: call to consteval function
> ‘((S2*)this)->S2::x.S1::S1(0)’ is not a constant expression
> 7 | S2(): x(0) {}
> | ^~~~
> test.cc:7:11: in ‘constexpr’ expansion of ‘((S2*)this)->S2::x.S1::S1(0)’
> test.cc:3:26: error: modification of ‘*(S2*)this’ is not a constant expression
> 3 | consteval S1(int n): a(n) {}
> | ^~~~
