https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101595
Bug ID: 101595
Summary: ICE: in tsubst_pack_expansion, at cp/pt.c:13124
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hewillk at gmail dot com
Target Milestone: ---
template<class>
concept C = true;
auto apply(auto f, auto... args) {
f(args...);
}
auto f(auto) {
apply(
[](auto... x) {
([] { if constexpr (C<decltype(x)>); }(), ...);
}, 0);
}
int main() {
f(0);
}
https://godbolt.org/z/eGjzePdf4
<source>: In instantiation of 'f<int>(int)::<lambda(auto:4 ...)> [with auto:4 =
{int}]':
<source>:5:4: required from 'auto apply(auto:1, auto:2 ...) [with auto:1 =
f<int>(int)::<lambda(auto:4 ...)>; auto:2 = {int}]'
<source>:9:8: required from 'auto f(auto:3) [with auto:3 = int]'
<source>:16:4: required from here
<source>:10:12: internal compiler error: in tsubst_pack_expansion, at
cp/pt.c:13124
10 | [](auto... x) {
| ~~~~^~~~~
0x1d75749 internal_error(char const*, ...)
???:0
0x72daa7 fancy_abort(char const*, int, char const*)
???:0
0x9a9f67 tsubst_pack_expansion(tree_node*, tree_node*, int, tree_node*)
???:0
0x9a9cb7 tsubst_pack_expansion(tree_node*, tree_node*, int, tree_node*)
???:0
0x995c67 instantiate_decl(tree_node*, bool, bool)
???:0
0x83defe maybe_instantiate_decl(tree_node*)
???:0
0x83f660 mark_used(tree_node*, int)
???:0
0x759055 build_op_call(tree_node*, vec<tree_node*, va_gc, vl_embed>**, int)
???:0
0x9fc005 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
???:0
0x995c67 instantiate_decl(tree_node*, bool, bool)
???:0
0x83defe maybe_instantiate_decl(tree_node*)
???:0
0x83f660 mark_used(tree_node*, int)
???:0
0x754867 build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
???:0
0x9fc18c finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
???:0
0x995c67 instantiate_decl(tree_node*, bool, bool)
???:0
0x83defe maybe_instantiate_decl(tree_node*)
???:0
0x83f660 mark_used(tree_node*, int)
???:0
0x754867 build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
???:0
0x9fc18c finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
???:0
0x95b245 c_parse_file()
???:0
Please submit a full bug report,
with preprocessed source if appropriate.
