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* [Bug c++/106596] New: Not a helpful diagnostic when putting things out of order in a member function
@ 2022-08-12 13:12 barry.revzin at gmail dot com
2022-08-12 13:23 ` [Bug c++/106596] " mpolacek at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: barry.revzin at gmail dot com @ 2022-08-12 13:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106596
Bug ID: 106596
Summary: Not a helpful diagnostic when putting things out of
order in a member function
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: barry.revzin at gmail dot com
Target Milestone: ---
Consider this example:
template <class T> concept C = true;
template <class T>
struct Widget {
void foo() requires C<T> noexcept;
};
The issue here is that the noexcept needs to go before the requires clause, but
how many people really remember what the order of these things needs to be?
The gcc 12.1 error for this is:
<source>:5:25: error: expected ';' at end of member declaration
5 | void foo() requires C<T> noexcept;
| ^~~~
| ;
<source>:5:30: error: expected unqualified-id before 'noexcept'
5 | void foo() requires C<T> noexcept;
| ^~~~~~~~
I suspect this might be a difficult thing to provide a diagnostic for, but this
particular one is pretty unhelpful. The first one is suggesting I needed to
write void foo() requires; which isn't even valid.
Hypothetical ideal:
<source>:5:30: error: the noexcept-specifier needs to precede the
requires-clause
5 | void foo() requires C<T> noexcept;
| ^~~~~~~~~~~~~ ^~~~~~~~
| noexcept requires C<T>;
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/106596] Not a helpful diagnostic when putting things out of order in a member function
2022-08-12 13:12 [Bug c++/106596] New: Not a helpful diagnostic when putting things out of order in a member function barry.revzin at gmail dot com
@ 2022-08-12 13:23 ` mpolacek at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2022-08-12 13:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106596
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Keywords| |diagnostic
CC| |mpolacek at gcc dot gnu.org
Last reconfirmed| |2022-08-12
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-08-12 13:12 [Bug c++/106596] New: Not a helpful diagnostic when putting things out of order in a member function barry.revzin at gmail dot com
2022-08-12 13:23 ` [Bug c++/106596] " mpolacek at gcc dot gnu.org
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