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* [Bug c++/109870] New: Miscomputation of return type of unevaluated lambda in type alias in template context
@ 2023-05-16 3:29 ed at catmur dot uk
2023-05-16 3:43 ` [Bug c++/109870] " pinskia at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: ed at catmur dot uk @ 2023-05-16 3:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109870
Bug ID: 109870
Summary: Miscomputation of return type of unevaluated lambda in
type alias in template context
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ed at catmur dot uk
Target Milestone: ---
template<class> struct X {};
template<class T>
struct M {
using R = decltype([] { return 1; }());
template<class U> struct S { X<R> p; };
};
M<int>::S<void> s;
9.1 through 14.0.0 trunk reject with:
<source>: In instantiation of 'struct M<int>::S<void>':
<source>:7:17: required from here
<source>:4:36: error: return-statement with a value, in function returning
'void' [-fpermissive]
4 | using R = decltype([] { return 1; }());
| ^
It appears the `U` type parameter in `M<T>::S<U>` is overwriting the lambda
deduced return type.
Possibly related to #92707, #103569
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/109870] Miscomputation of return type of unevaluated lambda in type alias in template context
2023-05-16 3:29 [Bug c++/109870] New: Miscomputation of return type of unevaluated lambda in type alias in template context ed at catmur dot uk
@ 2023-05-16 3:43 ` pinskia at gcc dot gnu.org
2024-04-13 8:22 ` pinskia at gcc dot gnu.org
2024-04-13 18:16 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-05-16 3:43 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109870
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Most likely a dup of a bug that PR 107430 depends on.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/109870] Miscomputation of return type of unevaluated lambda in type alias in template context
2023-05-16 3:29 [Bug c++/109870] New: Miscomputation of return type of unevaluated lambda in type alias in template context ed at catmur dot uk
2023-05-16 3:43 ` [Bug c++/109870] " pinskia at gcc dot gnu.org
@ 2024-04-13 8:22 ` pinskia at gcc dot gnu.org
2024-04-13 18:16 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-13 8:22 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109870
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2024-04-13
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. still fails.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/109870] Miscomputation of return type of unevaluated lambda in type alias in template context
2023-05-16 3:29 [Bug c++/109870] New: Miscomputation of return type of unevaluated lambda in type alias in template context ed at catmur dot uk
2023-05-16 3:43 ` [Bug c++/109870] " pinskia at gcc dot gnu.org
2024-04-13 8:22 ` pinskia at gcc dot gnu.org
@ 2024-04-13 18:16 ` pinskia at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-13 18:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109870
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=106221
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Very much related to PR 106221 .
^ permalink raw reply [flat|nested] 4+ messages in thread
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