https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84182
Bug ID: 84182
Summary: [8 Regression] ICE in variadic lambda inside a
template when calling a captured lambda
Product: gcc
Version: 8.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: benni.buch at gmail dot com
Target Milestone: ---
template < typename ... T > void sink(T ...){}
template < typename >
void f(){
auto const lambda = [](int){ return 1; };
[lambda](auto ... i){
sink(lambda(i) ...);
}(1);
}
int main(){
f< int >();
}
$ g++ -std=c++14 main.cpp
main.cpp: In instantiation of 'f() [with <template-parameter-1-1> =
int]::<lambda(auto:1 ...)> [with auto:1 = {int}]':
main.cpp:9:6: required from 'void f() [with <template-parameter-1-1> = int]'
main.cpp:13:14: required from here
main.cpp:7:24: internal compiler error: in lookup_template_class_1, at
cp/pt.c:8957
[lambda](auto ... i){
^
0x612f6a lookup_template_class_1
../../gcc/gcc/cp/pt.c:8957
0x612f6a lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
../../gcc/gcc/cp/pt.c:9167
0x940d5a tsubst_aggr_type
../../gcc/gcc/cp/pt.c:12073
0x93873f tsubst_copy
../../gcc/gcc/cp/pt.c:14845
0x92711d tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:18059
0x93a8e4 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:14365
0x93a8e4 tsubst(tree_node*, tree_node*, int, tree_node*)
../../gcc/gcc/cp/pt.c:14365
0x941873 tsubst_decl
../../gcc/gcc/cp/pt.c:13111
0x939eef tsubst_copy
../../gcc/gcc/cp/pt.c:14890
0x925ee0 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:18266
0x9275de tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:17663
0x934e49 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:17100
0x934e49 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16838
0x9436b2 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16030
0x9436b2 gen_elem_of_pack_expansion_instantiation
../../gcc/gcc/cp/pt.c:11175
0x9436b2 tsubst_pack_expansion(tree_node*, tree_node*, int, tree_node*)
../../gcc/gcc/cp/pt.c:11683
0x927ded tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:17684
0x934e49 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:17100
0x934e49 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16838
0x933970 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16059
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.
$ g++ --version
g++ (GCC) 8.0.1 20180202 (experimental)
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Known to work with GCC 6.3 and 5.4:
$ g++-6 --version
g++-6 (Ubuntu/Linaro 6.3.0-18ubuntu2~16.04) 6.3.0 20170519
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ g++-5 --version
g++-5 (Ubuntu 5.4.1-2ubuntu1~16.04) 5.4.1 20160904
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
