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* [Bug c++/66924] New: Bad diagnostic for parameter name used as non-type template argument
@ 2015-07-18 2:00 david.godfrey99 at gmail dot com
2024-04-15 23:25 ` [Bug c++/66924] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: david.godfrey99 at gmail dot com @ 2015-07-18 2:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66924
Bug ID: 66924
Summary: Bad diagnostic for parameter name used as non-type
template argument
Product: gcc
Version: 5.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: david.godfrey99 at gmail dot com
Target Milestone: ---
GCC does not give a good diagnostic for the following code:
template<int>
constexpr int variable{};
int main() {
auto f = [] (int x) -> decltype(variable<x>) {return{};};
}
The error is
error: parse error in template argument list
auto f = [] (int x) -> decltype(variable<x>) {return{};};
^
main.cpp:5:37: error: template argument 1 is invalid
This code is ill-formed, but the error should explain how x is not a constant
expression (as parameter names are never constant expressions).
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/66924] Bad diagnostic for parameter name used as non-type template argument
2015-07-18 2:00 [Bug c++/66924] New: Bad diagnostic for parameter name used as non-type template argument david.godfrey99 at gmail dot com
@ 2024-04-15 23:25 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-15 23:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66924
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note the "parse error" part of the diagnostic is no longer there on the trunk
(for GCC 14).
clang produces:
```
<source>:6:46: error: non-type template argument is not a constant expression
6 | auto f = [] (int x) -> decltype(variable<x>) {return{};};
| ^
<source>:6:46: note: function parameter 'x' with unknown value cannot be used
in a constant expression
<source>:6:22: note: declared here
6 | auto f = [] (int x) -> decltype(variable<x>) {return{};};
| ^
```
^ permalink raw reply [flat|nested] 2+ messages in thread
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2015-07-18 2:00 [Bug c++/66924] New: Bad diagnostic for parameter name used as non-type template argument david.godfrey99 at gmail dot com
2024-04-15 23:25 ` [Bug c++/66924] " pinskia at gcc dot gnu.org
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