[Bug c++/121012] New: Error on lambda with auto parameter as template argument

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121012

            Bug ID: 121012
           Summary: Error on lambda with auto parameter as template
                    argument
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/nfeh3Tbez

```
template<auto> int x;

int main() {
        x<[](auto) {}>;
}
```

```
<source>: In function 'int main()':
<source>:4:14: error: use of 'auto' in template argument
[-Wabbreviated-auto-in-template-arg]
    4 |         x<[](auto) {}>;
      |              ^~~~
Compiler returned: 1
```

This works in 15.1