https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115722
Bug ID: 115722
Summary: GCC uses old closure type when using as default
argument instead of using new closure type each time
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jlame646 at gmail dot com
Target Milestone: ---
The following program output `12` instead of `11`. The output `11` is expected
because as per [dcl.fct.default] "default argument is evaluated each time the
function is called with no argument for the corresponding parameter" and also
the type of a lambda expression is unique each time. Demo
https://godbolt.org/z/fM7Yxx7oz
```
#include <iostream>
int foo(int x = [](){ static int x = 0; return ++x; }()) { return x; };
int main() {
std::cout << foo() << foo(); // 12
}
```
