mizvekov wrote:

> Hi, is there a way to make a compile-time check for this feature?

Yes, this is exposed by a standard feature testing macro: 
https://en.cppreference.com/w/cpp/feature_test#cpp_template_template_args

> 
> Looking at
> 

Thanks for reporting this. A few questions:
* Does https://github.com/llvm/llvm-project/pull/90820 help here?
* Does it reproduce with GCC, using `-std=c++17` and above?
* Are you able to reduce this test case?


https://github.com/llvm/llvm-project/pull/89807
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