https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97375
--- Comment #1 from Anders Granlund <anders.granlund.0 at gmail dot com> ---
Here is another example of the same problem without using decltype(auto), so
the problem seems to be more general:
#include <iostream>
#include <type_traits>
template<const int I>
void f1()
{
std::cout << std::is_const_v<decltype(I)> << std::endl;
}
template<typename T, T I>
void f2()
{
std::cout << std::is_const_v<decltype(I)> << std::endl;
}
int main()
{
f1<0>(); // Outputs: 0 Ok
f2<const int, 0>(); // Outputs: 1 Not ok. Should output 0 also.
}
Compiler explorer link for this example: https://godbolt.org/z/8ah1ax
