https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116108
Bug ID: 116108
Summary: GCC crashes on incorrect code with -std=c++20
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: q1210081098 at gmail dot com
Target Milestone: ---
Reproducer: https://gcc.godbolt.org/z/37KzjK5T7
```cpp
#include <iostream>
namespace std
{
template<class T>
class size_t_class {
public:
typedef std::uintptr value_type;
const size_t_class value = 1;
constexpr bool operator == (size_t_class u) const { return true; }
template<class U> constexpr operator U()
{
return static_cast<U>(value);
}
};
}
struct Point3 {
std::size_t_class x = 0;
std::size_t_class y = 0;
};
int main() {
Point3 p = {4, std::size_t_class{2}};
p.x = 10;
return p.y<<'\n' ;
}
```
and get the error information
```
<source>:7:22: error: 'uintptr' in namespace 'std' does not name a type
7 | typedef std::uintptr value_type;
| ^~~~~~~
<source>:18:5: error: invalid use of template-name 'std::size_t_class' without
an argument list
18 | std::size_t_class x = 0;
| ^~~
<source>:19:5: error: invalid use of template-name 'std::size_t_class' without
an argument list
19 | std::size_t_class y = 0;
| ^~~
g++: internal compiler error: Segmentation fault signal terminated program
cc1plus
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 4
```
