error: class template placeholder not permitted in this context

The following snippet compiles in gcc 12.1 but not in gcc 11.1. Unfortunately, I only have gcc 11 at hand as I’m crosscompiling for a microcontroller. Is there a way to make it work? Also what is this cryptic "use ‘auto’ for an abbreviated function template" all about?

Demo

#include <cstdio>
#include <tuple>

template <typename T>
struct channel
{
    int a;
    T b;
};

template <typename... Channels>
struct light
{
    light(const std::tuple<Channels...>& channels)
        :   channels_ { channels }
    {
        
    }

    std::tuple<Channels...> channels_;
};

int main()
{
    light li(std::tuple{channel(2, 2), channel(2,false)});
}

Error (only in gcc 11.1):

<source>:25:14: error: class template placeholder 'std::tuple' not permitted in this context
   25 |     light li(std::tuple{channel(2, 2), channel(2,false)});
      |              ^~~
<source>:25:14: note: use 'auto' for an abbreviated function template

Interestingly, gcc 10.4 has something even different to say:

<source>:25:14: error: 'auto' parameter not permitted in this context
   25 |     light li(std::tuple{channel(2, 2), channel(2,false)});
      |              ^~~

I need a workaround that allows me to not specify all the template parameters of std::tuple as that would blow up my initializer to the point of unrecognizeability :/

>Solution :

I need a workaround …

light li{ std::tuple{channel(2, 2), channel(2, false)} };
//      ^                                              ^