https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104390
Bug ID: 104390
Summary: Tree check ICE for valid code
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: colavitam at gmail dot com
Target Milestone: ---
The following code produces an ICE (-std=c++17):
template <typename T>
struct A {};
struct B {
long v;
};
template<typename T, typename... F>
struct C {
template<F T::*... fields>
static void f(const A<T>& src) {}
};
void g() {
C<B, long>::f<&B::v>({});
}
---
<source>: In function 'void g()':
<source>:15:25: internal compiler error: tree check: accessed elt 2 of
'tree_vec' with 0 elts in tsubst_pack_expansion, at cp/pt.cc:13125
15 | C<B, long>::f<&B::v>({});
| ~~~~~~~~~~~~~~~~~~~~^~~~
