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* [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture
@ 2020-11-22 20:25 elel at 3wh dot net
2020-11-23 2:22 ` [Bug c++/97938] " mpolacek at gcc dot gnu.org
` (11 more replies)
0 siblings, 12 replies; 13+ messages in thread
From: elel at 3wh dot net @ 2020-11-22 20:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
Bug ID: 97938
Summary: g++ crash when inferring type of auto parameter pack
in lambda capture
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: elel at 3wh dot net
Target Milestone: ---
The following test case:
#include <iostream>
#include <tuple>
template <typename... Args>
int print_args(Args&&... args) {
std::cout << (args << ...);
return sizeof...(args);
}
template <typename T1, typename T2>
auto fwd(const T1& t1, const T2& t2) {
return std::apply([&t2] (auto&&... ts1) {
return std::apply([...ts1 = std::forward<decltype(ts1)>(ts1)] (auto&&...
ts2) {
return print_args(ts1..., std::forward<decltype(ts2)>(ts2)...);
}, t2);
}, t1);
}
int main() {
auto t1 = std::make_tuple(int{1}, float{2});
auto t2 = std::make_tuple(float{3}, int{4});
return fwd(t1, t2);
}
Compiled as:
g++ -std=c++20 -g -O2 gcc_crash.cpp
Crashes g++ with the following message:
gcc_crash.cpp: In instantiation of ‘fwd<std::tuple<int, float>,
std::tuple<float, int> >::<lambda(auto:11&& ...)> [with auto:11 = {const int&,
const float&}]’:
/usr/include/c++/10.2.0/type_traits:2506:26: required by substitution of
‘template<class _Fn, class ... _Args> static std::__result_of_success<decltype
(declval<_Fn>()((declval<_Args>)()...)), std::__invoke_other>
std::__result_of_other_impl::_S_test(int) [with _Fn = fwd<std::tuple<int,
float>, std::tuple<float, int> >::<lambda(auto:11&& ...)>; _Args = {const int&,
const float&}]’
/usr/include/c++/10.2.0/type_traits:2517:55: required from ‘struct
std::__result_of_impl<false, false, fwd<std::tuple<int, float>,
std::tuple<float, int> >::<lambda(auto:11&& ...)>, const int&, const float&>’
/usr/include/c++/10.2.0/type_traits:138:12: recursively required by
substitution of ‘template<class _Result, class _Ret> struct
std::__is_invocable_impl<_Result, _Ret, true, std::__void_t<typename
_CTp::type> > [with _Result = std::__invoke_result<fwd<std::tuple<int, float>,
std::tuple<float, int> >::<lambda(auto:11&& ...)>, const int&, const float&>;
_Ret = void]’
/usr/include/c++/10.2.0/type_traits:138:12: required from ‘struct
std::__and_<std::__is_invocable_impl<std::__invoke_result<fwd<std::tuple<int,
float>, std::tuple<float, int> >::<lambda(auto:11&& ...)>, const int&, const
float&>, void, true, void>,
std::__call_is_nothrow<std::__invoke_result<fwd<std::tuple<int, float>,
std::tuple<float, int> >::<lambda(auto:11&& ...)>, const int&, const float&>,
fwd<std::tuple<int, float>, std::tuple<float, int> >::<lambda(auto:11&& ...)>,
const int&, const float&> >’
/usr/include/c++/10.2.0/type_traits:2979:12: required from ‘struct
std::is_nothrow_invocable<fwd<std::tuple<int, float>, std::tuple<float, int>
>::<lambda(auto:11&& ...)>, const int&, const float&>’
/usr/include/c++/10.2.0/tuple:1715:37: required from ‘constexpr const bool
std::__unpack_std_tuple<template<class _Fn, class ... _ArgTypes> struct
std::is_nothrow_invocable, fwd<std::tuple<int, float>, std::tuple<float, int>
>::<lambda(auto:11&& ...)>, const std::tuple<int, float>&>’
/usr/include/c++/10.2.0/tuple:1730:14: required from ‘constexpr
decltype(auto) std::apply(_Fn&&, _Tuple&&) [with _Fn = fwd<std::tuple<int,
float>, std::tuple<float, int> >::<lambda(auto:11&& ...)>; _Tuple = const
std::tuple<int, float>&]’
gcc_crash.cpp:12:20: required from ‘auto fwd(const T1&, const T2&) [with T1 =
std::tuple<int, float>; T2 = std::tuple<float, int>]’
gcc_crash.cpp:22:20: required from here
gcc_crash.cpp:13:23: internal compiler error: Segmentation fault
13 | return std::apply([...ts1 = std::forward<decltype(ts1)>(ts1)]
(auto&&... ts2) {
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
14 | return print_args(ts1..., std::forward<decltype(ts2)>(ts2)...);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
15 | }, t2);
| ~
Please submit a full bug report,
with preprocessed source if appropriate.
In other scenarios (not the minimal test case above) the same bug triggers the
message:
internal compiler error: in cxx_incomplete_type_diagnostic, at cp/typeck2.c:584
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
@ 2020-11-23 2:22 ` mpolacek at gcc dot gnu.org
2020-11-23 2:23 ` [Bug c++/97938] 9/10/11 Regression] " mpolacek at gcc dot gnu.org
` (10 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2020-11-23 2:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
CC| |mpolacek at gcc dot gnu.org
Last reconfirmed| |2020-11-23
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] 9/10/11 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
2020-11-23 2:22 ` [Bug c++/97938] " mpolacek at gcc dot gnu.org
@ 2020-11-23 2:23 ` mpolacek at gcc dot gnu.org
2020-11-23 7:36 ` [Bug c++/97938] [9/10/11 " rguenth at gcc dot gnu.org
` (9 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2020-11-23 2:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|g++ crash when inferring |9/10/11 Regression] g++
|type of auto parameter pack |crash when inferring type
|in lambda capture |of auto parameter pack in
| |lambda capture
Target Milestone|--- |9.4
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] [9/10/11 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
2020-11-23 2:22 ` [Bug c++/97938] " mpolacek at gcc dot gnu.org
2020-11-23 2:23 ` [Bug c++/97938] 9/10/11 Regression] " mpolacek at gcc dot gnu.org
@ 2020-11-23 7:36 ` rguenth at gcc dot gnu.org
2021-04-01 22:39 ` jason at gcc dot gnu.org
` (8 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-11-23 7:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|9/10/11 Regression] g++ |[9/10/11 Regression] g++
|crash when inferring type |crash when inferring type
|of auto parameter pack in |of auto parameter pack in
|lambda capture |lambda capture
Keywords| |ice-on-valid-code
Priority|P3 |P2
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] [9/10/11 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
` (2 preceding siblings ...)
2020-11-23 7:36 ` [Bug c++/97938] [9/10/11 " rguenth at gcc dot gnu.org
@ 2021-04-01 22:39 ` jason at gcc dot gnu.org
2021-04-01 22:52 ` jason at gcc dot gnu.org
` (7 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2021-04-01 22:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
CC| |jason at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |jason at gcc dot gnu.org
--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Removed library dependency:
template <class F, class... Args>
auto apply(F&& f, Args&&... args) { return f(args...); }
template <class T> T&& forward(T&& t);
template <typename... Args>
int print_args(Args&&... args) {
return sizeof...(args);
}
template <typename T1, typename T2>
auto fwd(const T1& t1, const T2& t2) {
return ::apply([&t2] (auto&&... ts1) {
return ::apply([...ts1 = forward<decltype(ts1)>(ts1)] (auto&&... ts2) {
return print_args(ts1..., forward<decltype(ts2)>(ts2)...);
}, t2);
}, t1);
}
int main() {
auto t1 = 1;
auto t2 = 2;
return fwd(t1, t2);
}
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] [9/10/11 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
` (3 preceding siblings ...)
2021-04-01 22:39 ` jason at gcc dot gnu.org
@ 2021-04-01 22:52 ` jason at gcc dot gnu.org
2021-04-02 16:47 ` cvs-commit at gcc dot gnu.org
` (6 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2021-04-01 22:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Reduced more:
template <typename... Args>
int sink(Args&&... args) { return 2; }
template <typename T1>
auto fwd(const T1& t1) {
return
[] (auto&&... ts1) {
return
[...ts1 = ts1] () {
return sink(ts1...);
}();
}();
}
int main() {
return fwd(1);
}
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] [9/10/11 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
` (4 preceding siblings ...)
2021-04-01 22:52 ` jason at gcc dot gnu.org
@ 2021-04-02 16:47 ` cvs-commit at gcc dot gnu.org
2021-04-02 17:03 ` [Bug c++/97938] [9/10 " jason at gcc dot gnu.org
` (5 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-04-02 16:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:
https://gcc.gnu.org/g:2a26351b598242c2fbce95d2a0baacce0084aec6
commit r11-7961-g2a26351b598242c2fbce95d2a0baacce0084aec6
Author: Jason Merrill <jason@redhat.com>
Date: Fri Apr 2 11:05:46 2021 -0400
c++: lambda pack init-capture within generic lambda
We represent the type of a pack init-capture as auto... with packs from the
initializer stuck into PACK_EXPANSION_PARAMETER_PACKS so that expanding it
produces the right number of elements. But when partially instantiating
the
auto..., we were changing PACK_EXPANSION_PARAMETER_PACKS to refer to only
the auto itself. Fixed thus.
gcc/cp/ChangeLog:
PR c++/97938
* cp-tree.h (PACK_EXPANSION_AUTO_P): New.
* lambda.c (add_capture): Set it.
* pt.c (tsubst_pack_expansion): Handle it.
gcc/testsuite/ChangeLog:
PR c++/97938
* g++.dg/cpp2a/lambda-pack-init6.C: New test.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] [9/10 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
` (5 preceding siblings ...)
2021-04-02 16:47 ` cvs-commit at gcc dot gnu.org
@ 2021-04-02 17:03 ` jason at gcc dot gnu.org
2021-05-20 21:34 ` cvs-commit at gcc dot gnu.org
` (4 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2021-04-02 17:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[9/10/11 Regression] g++ |[9/10 Regression] g++
|crash when inferring type |crash when inferring type
|of auto parameter pack in |of auto parameter pack in
|lambda capture |lambda capture
--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for GCC 11 so far. Note that the original testcase has a syntax error in
print_args; the fold-expression line should be
(std::cout << ... << args);
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] [9/10 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
` (6 preceding siblings ...)
2021-04-02 17:03 ` [Bug c++/97938] [9/10 " jason at gcc dot gnu.org
@ 2021-05-20 21:34 ` cvs-commit at gcc dot gnu.org
2021-05-21 14:51 ` cvs-commit at gcc dot gnu.org
` (3 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-05-20 21:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:
https://gcc.gnu.org/g:5e7801808d2e9e99dc2931462c69a80c6f0e89cc
commit r10-9840-g5e7801808d2e9e99dc2931462c69a80c6f0e89cc
Author: Jason Merrill <jason@redhat.com>
Date: Fri Apr 2 11:05:46 2021 -0400
c++: lambda pack init-capture within generic lambda
We represent the type of a pack init-capture as auto... with packs from the
initializer stuck into PACK_EXPANSION_PARAMETER_PACKS so that expanding it
produces the right number of elements. But when partially instantiating
the
auto..., we were changing PACK_EXPANSION_PARAMETER_PACKS to refer to only
the auto itself. Fixed thus.
gcc/cp/ChangeLog:
PR c++/97938
* cp-tree.h (PACK_EXPANSION_AUTO_P): New.
* lambda.c (add_capture): Set it.
* pt.c (tsubst_pack_expansion): Handle it.
gcc/testsuite/ChangeLog:
PR c++/97938
* g++.dg/cpp2a/lambda-pack-init6.C: New test.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] [9/10 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
` (7 preceding siblings ...)
2021-05-20 21:34 ` cvs-commit at gcc dot gnu.org
@ 2021-05-21 14:51 ` cvs-commit at gcc dot gnu.org
2021-05-21 15:19 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-05-21 14:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:
https://gcc.gnu.org/g:7168fb621b4442936d2a9429389a65f15043e5e4
commit r9-9549-g7168fb621b4442936d2a9429389a65f15043e5e4
Author: Jason Merrill <jason@redhat.com>
Date: Fri Apr 2 11:05:46 2021 -0400
c++: lambda pack init-capture within generic lambda
We represent the type of a pack init-capture as auto... with packs from the
initializer stuck into PACK_EXPANSION_PARAMETER_PACKS so that expanding it
produces the right number of elements. But when partially instantiating
the
auto..., we were changing PACK_EXPANSION_PARAMETER_PACKS to refer to only
the auto itself. Fixed thus.
gcc/cp/ChangeLog:
PR c++/97938
* cp-tree.h (PACK_EXPANSION_AUTO_P): New.
* lambda.c (add_capture): Set it.
* pt.c (tsubst_pack_expansion): Handle it.
gcc/testsuite/ChangeLog:
PR c++/97938
* g++.dg/cpp2a/lambda-pack-init6.C: New test.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] [9/10 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
` (8 preceding siblings ...)
2021-05-21 14:51 ` cvs-commit at gcc dot gnu.org
@ 2021-05-21 15:19 ` jason at gcc dot gnu.org
2021-05-24 8:33 ` cvs-commit at gcc dot gnu.org
2022-05-12 12:47 ` jason at gcc dot gnu.org
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2021-05-21 15:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #8 from Jason Merrill <jason at gcc dot gnu.org> ---
Fixed for 9.4/10.4/11.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] [9/10 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
` (9 preceding siblings ...)
2021-05-21 15:19 ` jason at gcc dot gnu.org
@ 2021-05-24 8:33 ` cvs-commit at gcc dot gnu.org
2022-05-12 12:47 ` jason at gcc dot gnu.org
11 siblings, 0 replies; 13+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-05-24 8:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Christophe Lyon
<clyon@gcc.gnu.org>:
https://gcc.gnu.org/g:ba19b5543d31a76f494e76c32a548d70ac4d3cc1
commit r9-9553-gba19b5543d31a76f494e76c32a548d70ac4d3cc1
Author: Christophe Lyon <christophe.lyon@linaro.org>
Date: Mon May 24 07:35:44 2021 +0000
c++: lambda pack init-capture within generic lambda
In gcc-9-branch, the testsuite does not support the c++20 target
selector: use c++2a instead, to avoid Dejagnu errors when running the
testsuite.
2021-05-24 Christophe Lyon <christophe.lyon@linaro.org>
PR c++/97938
gcc/testsuite/
* g++.dg/cpp2a/lambda-pack-init6.C: Use c++2a target selector.
^ permalink raw reply [flat|nested] 13+ messages in thread
* [Bug c++/97938] [9/10 Regression] g++ crash when inferring type of auto parameter pack in lambda capture
2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
` (10 preceding siblings ...)
2021-05-24 8:33 ` cvs-commit at gcc dot gnu.org
@ 2022-05-12 12:47 ` jason at gcc dot gnu.org
11 siblings, 0 replies; 13+ messages in thread
From: jason at gcc dot gnu.org @ 2022-05-12 12:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97938
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|9.4 |10.4
--- Comment #10 from Jason Merrill <jason at gcc dot gnu.org> ---
Not actually fixed on 9 branch.
^ permalink raw reply [flat|nested] 13+ messages in thread
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2020-11-22 20:25 [Bug c++/97938] New: g++ crash when inferring type of auto parameter pack in lambda capture elel at 3wh dot net
2020-11-23 2:22 ` [Bug c++/97938] " mpolacek at gcc dot gnu.org
2020-11-23 2:23 ` [Bug c++/97938] 9/10/11 Regression] " mpolacek at gcc dot gnu.org
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