https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84181
--- Comment #5 from Benjamin Buch <benni.buch at gmail dot com> ---
I'm not completely sure anymore whether this is related, another version of the
new bug is:
template < typename ... T >
void sink(T ...){}
template < typename T >
auto var = [](auto ... i){ sink(i + 0 ...); }();
int main(){
var< int >;
}
$ g++ -std=c++14 main3.cpp
main3.cpp: In instantiation of '<lambda(auto:1 ...)> [with auto:1 = {}]':
main3.cpp:5:46: required from 'auto var<int>'
main3.cpp:8:5: required from here
main3.cpp:5:32: internal compiler error: Segmentation fault
auto var = [](auto ... i){ sink(i + 0 ...); }();
~~~~^~~~~~~~~~~
0xe79ecf crash_signal
../../gcc/gcc/toplev.c:325
0x916d50 contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
../../gcc/gcc/tree.h:3245
0x916d50 enclosing_instantiation_of
../../gcc/gcc/cp/pt.c:12694
0x942a7e tsubst_pack_expansion(tree_node*, tree_node*, int, tree_node*)
../../gcc/gcc/cp/pt.c:11450
0x927dcd tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:17684
0x934e29 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:17100
0x934e29 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16838
0x933950 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16059
0x931f41 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16322
0x931f41 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16322
0x931f41 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16322
0x9311d8 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16030
0x9311d8 instantiate_decl(tree_node*, bool, bool)
../../gcc/gcc/cp/pt.c:23384
0x87aeeb maybe_instantiate_decl
../../gcc/gcc/cp/decl2.c:5178
0x87ccf8 mark_used(tree_node*, int)
../../gcc/gcc/cp/decl2.c:5273
0x7e7c90 build_over_call
../../gcc/gcc/cp/call.c:8201
0x7f5f1c build_op_call_1
../../gcc/gcc/cp/call.c:4567
0x7f5f1c build_op_call(tree_node*, vec<tree_node*, va_gc, vl_embed>**, int)
../../gcc/gcc/cp/call.c:4596
0x970075 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
../../gcc/gcc/cp/semantics.c:2506
0x92849e tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:17874
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
