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From: "davidfromonline at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/100295] New: Internal compiler error from generic lambda capturing parameter pack and expanding it in if constexpr Date: Tue, 27 Apr 2021 18:44:53 +0000 [thread overview] Message-ID: <bug-100295-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100295 Bug ID: 100295 Summary: Internal compiler error from generic lambda capturing parameter pack and expanding it in if constexpr Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: davidfromonline at gmail dot com Target Milestone: --- The following well-formed translation unit ``` template<typename... Ts> void f(Ts... ts) { auto lambda = [=](auto x) { if constexpr (sizeof((..., ts), x) != 0) { (..., ts); } }; lambda(0); } void g() { f(0); } ``` causes gcc to crash with ``` <source>: In instantiation of ‘f<int>(int)::<lambda(auto:1)> [with auto:1 = int]’: <source>:8:8: required from ‘void f(Ts ...) [with Ts = {int}]’ <source>:12:3: required from here <source>:5:31: internal compiler error: trying to capture ‘ts#0’ in instantiation of generic lambda 5 | (..., ts); | ^~ 0x9c9318 add_capture(tree_node*, tree_node*, tree_node*, bool, bool) ../../source/gcc/cp/lambda.c:637 0x9c9391 add_default_capture(tree_node*, tree_node*, tree_node*) ../../source/gcc/cp/lambda.c:697 0xaa68ef tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../source/gcc/cp/pt.c:20834 0xaa3ea8 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../source/gcc/cp/pt.c:20949 0xaaf3d7 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../source/gcc/cp/pt.c:19204 0xaae9d1 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../source/gcc/cp/pt.c:18229 0xaae9d1 gen_elem_of_pack_expansion_instantiation ../../source/gcc/cp/pt.c:12568 0xaae9d1 tsubst_pack_expansion(tree_node*, tree_node*, int, tree_node*) ../../source/gcc/cp/pt.c:13233 0xaa163f tsubst_fold_expr_pack ../../source/gcc/cp/pt.c:12646 0xaa163f tsubst_unary_left_fold ../../source/gcc/cp/pt.c:12685 0xaa163f tsubst_copy ../../source/gcc/cp/pt.c:17343 0xaa56f2 tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool, bool) ../../source/gcc/cp/pt.c:20962 0xaaf3d7 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../source/gcc/cp/pt.c:19204 0xab11f9 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../source/gcc/cp/pt.c:18274 0xab0aa3 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../source/gcc/cp/pt.c:18595 0xab4503 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../source/gcc/cp/pt.c:18564 0xab0aa3 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../source/gcc/cp/pt.c:18595 0xab0aa3 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../source/gcc/cp/pt.c:18595 0xab8308 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool) ../../source/gcc/cp/pt.c:18229 0xab8308 instantiate_body ../../source/gcc/cp/pt.c:25921 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. Compiler returned: 1 ```
next reply other threads:[~2021-04-27 18:44 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-27 18:44 davidfromonline at gmail dot com [this message] 2021-04-28 12:30 ` [Bug c++/100295] " ppalka at gcc dot gnu.org 2021-10-21 4:21 ` pinskia at gcc dot gnu.org 2021-10-21 4:22 ` pinskia at gcc dot gnu.org 2022-08-24 1:50 ` pinskia at gcc dot gnu.org 2022-12-03 9:08 ` pinskia at gcc dot gnu.org 2022-12-15 21:03 ` cvs-commit at gcc dot gnu.org 2022-12-15 21:04 ` ppalka at gcc dot gnu.org 2022-12-19 16:54 ` cvs-commit at gcc dot gnu.org 2023-02-17 13:24 ` ppalka at gcc dot gnu.org 2023-05-22 3:12 ` cvs-commit at gcc dot gnu.org 2023-05-22 3:15 ` ppalka at gcc dot gnu.org
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