https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78334
--- Comment #2 from Anatoliy Tomilov <tomilovanatoliy at yandex dot ru> --- (In reply to Markus Trippelsdorf from comment #1) > markus@x4 /tmp % cat lam.ii > template <auto> auto constexpr_string([](auto) {}); > void foo() { constexpr_string<0>(0); }; > > markus@x4 /tmp % clang++ -c -std=c++1z lam.ii > markus@x4 /tmp % /var/tmp/gcc_test/usr/local/bin/g++ -c -std=c++1z lam.ii > lam.ii: In instantiation of ‘struct<lambda>’: > lam.ii:1:22: required from ‘auto constexpr_string<0>’ > lam.ii:2:14: required from here > lam.ii:1:46: internal compiler error: Segmentation fault Why clang++? I sure this bug tracker is about g++.