https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107457
Bug ID: 107457
Summary: ICE when template lambda alias used as default
template argument
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: aandrejevas5 at gmail dot com
Target Milestone: ---
The following code causes an ICE with GCC 12.2.0 until trunk, on
-std=c++{20,23}:
template<class T>
using lambda = decltype([]() {});
template<class R, class F = lambda<R>>
void test() {}
int main() {
test<int>();
}
godbolt: https://godbolt.org/z/Mx1z77hTn
Error message:
PS> g++ -std=c++20 "main_ice.cpp" -o"bin\main_ice.exe"
main_ice.cpp: In substitution of 'template<class T> using lambda = decltype
(<lambda>) [with T = R]':
main_ice.cpp:4:36: required from here
main_ice.cpp:2:25: internal compiler error: Segmentation fault
2 | using lambda = decltype([]() {});
| ^~~~~~~
libbacktrace could not find executable to open
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://github.com/msys2/MINGW-packages/issues> for instructions.
