https://gcc.gnu.org/g:6f7c038eee71e519571df5741413f0547fbe85a7
commit r16-7145-g6f7c038eee71e519571df5741413f0547fbe85a7 Author: Marek Polacek <[email protected]> Date: Thu Jan 29 09:39:12 2026 -0500 c++/reflection: add fixed test [PR123871] Incredibly, a patch that I just pushed (r16-7140-g101f2970adc0a7) fixed this ICE. I notice that we don't emit the diag_array_subscript diagnostic because slice calls fold_non_dependent_expr which calls _eval_outermost with allow_non_constant=true. I wonder if we want to change this. PR c++/123871 gcc/testsuite/ChangeLog: * g++.dg/reflect/error11.C: New test. Diff: --- gcc/testsuite/g++.dg/reflect/error11.C | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/gcc/testsuite/g++.dg/reflect/error11.C b/gcc/testsuite/g++.dg/reflect/error11.C new file mode 100644 index 000000000000..d6c94fb276e4 --- /dev/null +++ b/gcc/testsuite/g++.dg/reflect/error11.C @@ -0,0 +1,22 @@ +// PR c++/123871 +// { dg-do compile { target c++26 } } +// { dg-additional-options "-freflection" } + +#include <meta> + +template<class T> +consteval auto +test () +{ + auto lambda = [](this auto){ + constexpr std::meta::info array[1] = {^^T}; + using X = [: array[100] :]; // { dg-error "splice argument must be" } + sizeof(X); + }; +} + +void +g () +{ + test<int>(); +}
