https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92654
Bug ID: 92654
Summary: internal compiler error: in lookup_template_class_1
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fiesh at zefix dot tv
Target Milestone: ---
The following code results in an internal compiler error in 8, 9, and trunk:
namespace a {
template <typename b, b>
struct c {};
template <typename>
using d = int;
template <typename b, b...>
struct e {};
template <typename b, b g>
using h = e<b, __integer_pack(g)...>;
} // namespace a
template <typename ab, typename i, i... ac>
void ad(ab f, a::e<i, ac...>) {
(f(a::c<i, ac>{}), ...);
}
template <auto j, typename ab>
void k(ab f) {
using i = a::d<decltype(j)>;
using l = a::h<i, j>;
ad(f, l{});
}
template <typename ag, typename ab>
void ah(ab f) {
auto a{f};
k<m(ag{})>(a);
}
enum n {};
constexpr int m(n) { return 2; }
template <n>
struct o;
template <template <n, long, n, long> typename>
void am() {
ah<n>([](auto an) {
auto b = decltype(an)();
[b] {
if constexpr (o<b>::aq)
;
};
});
}
template <n, long, n, long>
struct p;
void as() { am<p>; }
% g++ -std=c++17 crash.cpp
...
crash.cpp:34:5: internal compiler error: in lookup_template_class_1, at
cp/pt.c:9546
Although we ran into the bugs entirely independently, maybe it's related to
#92583?
