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From: "n60wb42d2 at relay dot firefox.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/99631] decltype of non-type template-parameter shouldn't be
 const
Date: Tue, 09 Nov 2021 17:23:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99631

n60wb42d2 at relay dot firefox.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |n60wb42d2 at relay dot fir=
efox.com

--- Comment #4 from n60wb42d2 at relay dot firefox.com ---
(In reply to Jonathan Wakely from comment #1)
> I'm not sure "rejects-valid" is appropriate, as it only fails to compile
> because of the static assert (i.e. you've asked for it).

Here it `rejects-valid`:

```c++
struct param{};

template<typename>
struct t;
template<>
struct t<param>{};

template<param... p>
auto test()
{
    (void)t<decltype(p)...>{};
}

int main()
{
    test<param{}>();
}
```
```
<source>:11:5: error: invalid use of incomplete type 'struct t<const param>'
   11 |     (void)t<decltype(p)...>{};
```

https://godbolt.org/z/MKxx1dobT=