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* [Bug c++/99583] New: Parameter packs not expanded in lambda noexcept specifier
@ 2021-03-14 8:13 hewillk at gmail dot com
2021-03-15 8:47 ` [Bug c++/99583] " rguenth at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: hewillk at gmail dot com @ 2021-03-14 8:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99583
Bug ID: 99583
Summary: Parameter packs not expanded in lambda noexcept
specifier
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hewillk at gmail dot com
Target Milestone: ---
The following valid code failed since gcc-4.7
void f(...);
template <bool... B>
void g() {
f([]() noexcept(B) {} ...);
}
(goldbot: https://gcc.godbolt.org/z/WoKaab)
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/99583] Parameter packs not expanded in lambda noexcept specifier
2021-03-14 8:13 [Bug c++/99583] New: Parameter packs not expanded in lambda noexcept specifier hewillk at gmail dot com
@ 2021-03-15 8:47 ` rguenth at gcc dot gnu.org
2021-04-01 20:07 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-03-15 8:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99583
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Last reconfirmed| |2021-03-15
Version|4.7.0 |10.2.1
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Known to fail| |10.2.0, 11.0, 7.5.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
> g++-10 -S t.C
t.C: In function 'void g()':
t.C:5:24: error: expansion pattern '<lambda>' contains no parameter packs
5 | f([]() noexcept(B) {} ...);
| ^~~
clang accepts it.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/99583] Parameter packs not expanded in lambda noexcept specifier
2021-03-14 8:13 [Bug c++/99583] New: Parameter packs not expanded in lambda noexcept specifier hewillk at gmail dot com
2021-03-15 8:47 ` [Bug c++/99583] " rguenth at gcc dot gnu.org
@ 2021-04-01 20:07 ` cvs-commit at gcc dot gnu.org
2021-04-01 20:08 ` jason at gcc dot gnu.org
2021-04-15 19:03 ` cvs-commit at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-04-01 20:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99583
--- Comment #2 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:0cf4813202f19768e31666f6aa82bde4dce4065a
commit r11-7953-g0cf4813202f19768e31666f6aa82bde4dce4065a
Author: Jason Merrill <jason@redhat.com>
Date: Thu Apr 1 15:17:40 2021 -0400
c++: variadic lambda noexcept-specifier [PR99583]
The tree-walk looking for parameter packs didn't find this one because we
weren't stepping into TYPE_RAISES_EXCEPTIONS.
gcc/cp/ChangeLog:
PR c++/99583
PR c++/99584
* tree.c (cp_walk_subtrees) [FUNCTION_TYPE]: Walk into
TYPE_RAISES_EXCEPTIONS.
gcc/testsuite/ChangeLog:
PR c++/99583
* g++.dg/cpp0x/lambda/lambda-variadic12.C: New test.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/99583] Parameter packs not expanded in lambda noexcept specifier
2021-03-14 8:13 [Bug c++/99583] New: Parameter packs not expanded in lambda noexcept specifier hewillk at gmail dot com
2021-03-15 8:47 ` [Bug c++/99583] " rguenth at gcc dot gnu.org
2021-04-01 20:07 ` cvs-commit at gcc dot gnu.org
@ 2021-04-01 20:08 ` jason at gcc dot gnu.org
2021-04-15 19:03 ` cvs-commit at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: jason at gcc dot gnu.org @ 2021-04-01 20:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99583
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
Resolution|--- |DUPLICATE
Status|NEW |RESOLVED
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> ---
Same issue.
*** This bug has been marked as a duplicate of bug 99584 ***
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/99583] Parameter packs not expanded in lambda noexcept specifier
2021-03-14 8:13 [Bug c++/99583] New: Parameter packs not expanded in lambda noexcept specifier hewillk at gmail dot com
` (2 preceding siblings ...)
2021-04-01 20:08 ` jason at gcc dot gnu.org
@ 2021-04-15 19:03 ` cvs-commit at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-04-15 19:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99583
--- 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:2efbbba16a0630fac8cadcd6d9e0ffaabfadb79f
commit r11-8201-g2efbbba16a0630fac8cadcd6d9e0ffaabfadb79f
Author: Jason Merrill <jason@redhat.com>
Date: Thu Apr 15 13:38:54 2021 -0400
c++: noexcept error recursion [PR100101]
Here instantiating the noexcept-specifier for bar<void>() means
instantiating A<void>::value, which complains about the conversion from 0
to
int* in the default argument of foo. Since my patch for PR99583, printing
the error context involves looking at C<void>::type, which again wants to
instantiate A<void>::value, which breaks. For now at least, let's break
this recursion by avoiding looking into the noexcept-specifier in
find_typenames, and limit that to just the uses_parameter_packs case that
PR99583 cares about.
gcc/cp/ChangeLog:
PR c++/100101
PR c++/99583
* pt.c (find_parameter_packs_r) [FUNCTION_TYPE]: Walk into
TYPE_RAISES_EXCEPTIONS here.
* tree.c (cp_walk_subtrees): Not here.
gcc/testsuite/ChangeLog:
PR c++/100101
* g++.dg/cpp0x/noexcept67.C: New test.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2021-03-14 8:13 [Bug c++/99583] New: Parameter packs not expanded in lambda noexcept specifier hewillk at gmail dot com
2021-03-15 8:47 ` [Bug c++/99583] " rguenth at gcc dot gnu.org
2021-04-01 20:07 ` cvs-commit at gcc dot gnu.org
2021-04-01 20:08 ` jason at gcc dot gnu.org
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