https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84181
Benjamin Buch <benni.buch at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |REOPENED Resolution|FIXED |--- --- Comment #4 from Benjamin Buch <benni.buch at gmail dot com> --- Thanks for your fast patching! I found another variant of this bug if you use a variable template instead of a function: template < int ... I > struct A{}; template < typename T > auto var = [](auto ... i){ return A< decltype(i)::x ... >{}; }; int main(){ var< int >(); } $ g++ -std=c++14 main3.cpp main3.cpp: In instantiation of '<lambda(auto:1 ...)> [with auto:1 = {}]': main3.cpp:10:16: required from here main3.cpp:6:40: internal compiler error: Segmentation fault return A< decltype(i)::x ... >{}; ^ 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 0x94452a tsubst_template_args ../../gcc/gcc/cp/pt.c:11836 0x944438 tsubst_template_args ../../gcc/gcc/cp/pt.c:11854 0x940d15 tsubst_aggr_type ../../gcc/gcc/cp/pt.c:12067 0x93b25e tsubst(tree_node*, tree_node*, int, tree_node*) ../../gcc/gcc/cp/pt.c:13706 0x926df4 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../gcc/gcc/cp/pt.c:18153 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 0x932e80 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../gcc/gcc/cp/pt.c:16055 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 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.