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* [Bug c++/95434] New: ICE for CTAD in generic lambda within variadic lambda
@ 2020-05-30 5:34 johelegp at gmail dot com
2020-05-30 5:41 ` [Bug c++/95434] " johelegp at gmail dot com
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: johelegp at gmail dot com @ 2020-05-30 5:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95434
Bug ID: 95434
Summary: ICE for CTAD in generic lambda within variadic lambda
Product: gcc
Version: 10.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: johelegp at gmail dot com
Target Milestone: ---
The following snippet ICEs. See https://godbolt.org/z/-fZVX4.
```C++
template <class T> struct type { T value; };
template <class T> type(T) -> type<T>;
void f()
{
[]<template <class> class... Ts>()
{
(..., []<template <class> class T>() {
T{0};
}.template operator()<Ts>());
}
.template operator()<type>();
}
```
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/95434] ICE for CTAD in generic lambda within variadic lambda
2020-05-30 5:34 [Bug c++/95434] New: ICE for CTAD in generic lambda within variadic lambda johelegp at gmail dot com
@ 2020-05-30 5:41 ` johelegp at gmail dot com
2020-07-14 20:59 ` ppalka at gcc dot gnu.org
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: johelegp at gmail dot com @ 2020-05-30 5:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95434
Johel Ernesto Guerrero Peña <johelegp at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |johelegp at gmail dot com
--- Comment #1 from Johel Ernesto Guerrero Peña <johelegp at gmail dot com> ---
Perhaps it's related to the following snippet that errors. I don't see why it
shouldn't work. Should I open a separate bug report on this?
```C++
template <template <class> class... Ts>
void g()
{
(..., Ts{0}); // error: operand of fold expression has no unexpanded
parameter packs
}
```
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/95434] ICE for CTAD in generic lambda within variadic lambda
2020-05-30 5:34 [Bug c++/95434] New: ICE for CTAD in generic lambda within variadic lambda johelegp at gmail dot com
2020-05-30 5:41 ` [Bug c++/95434] " johelegp at gmail dot com
@ 2020-07-14 20:59 ` ppalka at gcc dot gnu.org
2020-08-12 0:51 ` johelegp at gmail dot com
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: ppalka at gcc dot gnu.org @ 2020-07-14 20:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95434
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2020-07-14
CC| |ppalka at gcc dot gnu.org
--- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Confirmed. Fails on trunk, too.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/95434] ICE for CTAD in generic lambda within variadic lambda
2020-05-30 5:34 [Bug c++/95434] New: ICE for CTAD in generic lambda within variadic lambda johelegp at gmail dot com
2020-05-30 5:41 ` [Bug c++/95434] " johelegp at gmail dot com
2020-07-14 20:59 ` ppalka at gcc dot gnu.org
@ 2020-08-12 0:51 ` johelegp at gmail dot com
2021-01-19 15:08 ` ppalka at gcc dot gnu.org
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: johelegp at gmail dot com @ 2020-08-12 0:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95434
--- Comment #3 from Johel Ernesto Guerrero Peña <johelegp at gmail dot com> ---
Another example: https://godbolt.org/z/Wq1vjP. Perhaps, this too requires
another bug report.
```C++
template <template <class> class T, class... Us>
concept ctadable = requires(Us... us) { T{us...}; };
template <class T>
struct X { T x; };
static_assert(ctadable<X, int>);
```
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/95434] ICE for CTAD in generic lambda within variadic lambda
2020-05-30 5:34 [Bug c++/95434] New: ICE for CTAD in generic lambda within variadic lambda johelegp at gmail dot com
` (2 preceding siblings ...)
2020-08-12 0:51 ` johelegp at gmail dot com
@ 2021-01-19 15:08 ` ppalka at gcc dot gnu.org
2021-01-20 14:55 ` cvs-commit at gcc dot gnu.org
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: ppalka at gcc dot gnu.org @ 2021-01-19 15:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95434
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |ppalka at gcc dot gnu.org
Status|NEW |ASSIGNED
--- Comment #4 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Looks like the testcases in comment #1 and comment #3 are PR98611 and are fixed
for GCC 11 with r11-6614.
We still ICE on your original testcase though. Reduced:
template <class>
void f() {
[]<template <class> class U>() { U{0}; };
}
template void f<int>();
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/95434] ICE for CTAD in generic lambda within variadic lambda
2020-05-30 5:34 [Bug c++/95434] New: ICE for CTAD in generic lambda within variadic lambda johelegp at gmail dot com
` (3 preceding siblings ...)
2021-01-19 15:08 ` ppalka at gcc dot gnu.org
@ 2021-01-20 14:55 ` cvs-commit at gcc dot gnu.org
2021-02-03 5:43 ` johelegp at gmail dot com
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-01-20 14:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95434
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:
https://gcc.gnu.org/g:cafcfcb5840b62d9fc80c12192189351e995a4f2
commit r11-6816-gcafcfcb5840b62d9fc80c12192189351e995a4f2
Author: Patrick Palka <ppalka@redhat.com>
Date: Wed Jan 20 09:44:33 2021 -0500
c++: Fix tsubsting CLASS_PLACEHOLDER_TEMPLATE [PR95434]
Here, during partial instantiation of the generic lambda, we do
tsubst_copy on the CLASS_PLACEHOLDER_TEMPLATE for U{0} which yields a
(level-lowered) TEMPLATE_TEMPLATE_PARM rather than the corresponding
TEMPLATE_DECL. This later confuses do_class_deduction which expects
that a CLASS_PLACEHOLDER_TEMPLATE is always a TEMPLATE_DECL.
gcc/cp/ChangeLog:
PR c++/95434
* pt.c (tsubst) <case TEMPLATE_TYPE_PARM>: If tsubsting
CLASS_PLACEHOLDER_TEMPLATE yields a TEMPLATE_TEMPLATE_PARM,
adjust to its TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL.
gcc/testsuite/ChangeLog:
PR c++/95434
* g++.dg/cpp2a/lambda-generic9.C: New test.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/95434] ICE for CTAD in generic lambda within variadic lambda
2020-05-30 5:34 [Bug c++/95434] New: ICE for CTAD in generic lambda within variadic lambda johelegp at gmail dot com
` (4 preceding siblings ...)
2021-01-20 14:55 ` cvs-commit at gcc dot gnu.org
@ 2021-02-03 5:43 ` johelegp at gmail dot com
2021-04-20 16:09 ` cvs-commit at gcc dot gnu.org
2021-04-20 16:11 ` ppalka at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: johelegp at gmail dot com @ 2021-02-03 5:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95434
Johel Ernesto Guerrero Peña <johelegp at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |11.0
Status|ASSIGNED |RESOLVED
URL| |https://godbolt.org/z/-fZVX
| |4
Known to fail| |10.1.0
Resolution|--- |FIXED
--- Comment #6 from Johel Ernesto Guerrero Peña <johelegp at gmail dot com> ---
Thank you.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/95434] ICE for CTAD in generic lambda within variadic lambda
2020-05-30 5:34 [Bug c++/95434] New: ICE for CTAD in generic lambda within variadic lambda johelegp at gmail dot com
` (5 preceding siblings ...)
2021-02-03 5:43 ` johelegp at gmail dot com
@ 2021-04-20 16:09 ` cvs-commit at gcc dot gnu.org
2021-04-20 16:11 ` ppalka at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-04-20 16:09 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95434
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:
https://gcc.gnu.org/g:2400f81c2c2489f4b6fbb245ef946a39be40defd
commit r10-9734-g2400f81c2c2489f4b6fbb245ef946a39be40defd
Author: Patrick Palka <ppalka@redhat.com>
Date: Tue Apr 20 12:06:27 2021 -0400
c++: Fix tsubsting CLASS_PLACEHOLDER_TEMPLATE [PR95434]
Here, during partial instantiation of the generic lambda, we do
tsubst_copy on the CLASS_PLACEHOLDER_TEMPLATE for U{0} which yields a
(level-lowered) TEMPLATE_TEMPLATE_PARM rather than the corresponding
TEMPLATE_DECL. This later confuses do_class_deduction which expects
that a CLASS_PLACEHOLDER_TEMPLATE is always a TEMPLATE_DECL.
gcc/cp/ChangeLog:
PR c++/95434
* pt.c (tsubst) <case TEMPLATE_TYPE_PARM>: If tsubsting
CLASS_PLACEHOLDER_TEMPLATE yields a TEMPLATE_TEMPLATE_PARM,
adjust to its TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL.
gcc/testsuite/ChangeLog:
PR c++/95434
* g++.dg/cpp2a/lambda-generic9.C: New test.
(cherry picked from commit cafcfcb5840b62d9fc80c12192189351e995a4f2)
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/95434] ICE for CTAD in generic lambda within variadic lambda
2020-05-30 5:34 [Bug c++/95434] New: ICE for CTAD in generic lambda within variadic lambda johelegp at gmail dot com
` (6 preceding siblings ...)
2021-04-20 16:09 ` cvs-commit at gcc dot gnu.org
@ 2021-04-20 16:11 ` ppalka at gcc dot gnu.org
7 siblings, 0 replies; 9+ messages in thread
From: ppalka at gcc dot gnu.org @ 2021-04-20 16:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95434
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |10.4
^ permalink raw reply [flat|nested] 9+ messages in thread
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2020-05-30 5:34 [Bug c++/95434] New: ICE for CTAD in generic lambda within variadic lambda johelegp at gmail dot com
2020-05-30 5:41 ` [Bug c++/95434] " johelegp at gmail dot com
2020-07-14 20:59 ` ppalka at gcc dot gnu.org
2020-08-12 0:51 ` johelegp at gmail dot com
2021-01-19 15:08 ` ppalka at gcc dot gnu.org
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2021-02-03 5:43 ` johelegp at gmail dot com
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