Terminated after throwing 'fmt::v7::system_error'

[sunmy2019]

I am writing codes for #2319 . During testing I found that:
Mixed using of "char" and "wchar" would cause this bug.

See https://godbolt.org/z/fWx84x8cv

This issue starts at release 6.0.0.

#include <fmt/format.h>

int main () {
    fmt::print("{}",42);
    fmt::print(L"{}",42);
}

I searched this error in issues, nothing found. I post it here. I don't know if it's a feature or a bug, or a known issue.

[sunmy2019]

This looks like a feature. Closed now.

[vitaut]

This is a stdio, not {fmt} problem. I wouldn't recommend using wchar_t with I/O at all.