How to ignore whitespace after scan?

[ikspress]

#include <cstdio>
#include <exception>
#include <fmt/base.h>
#include <scn/scan.h>
#include <string>

int main() try {
    fmt::println("{}", scn::scan<std::string>(stdin, "{:[^\n]}")->value());
    auto result = scn::scan<std::string>(stdin, "{:[^\n]}");
    if (result)
        fmt::println("{}", result->value());
    else
        fmt::println("{}", result.error().msg());
} catch (std::exception const &e) {
    fmt::println(stderr, "{}", e.what());
    return 1;
}

I tried to read a line of text from console, but it fails due to a residue \n.

Hello, world!
Hello, world!
No characters matched in [character set]

Is there any way to ignore all whitespace characters before read?