Gcc compilation error after upgrade to v4

[egorpugin]

In file included from /root/.sw/storage/pkg/03/34/516e/src/sdir/include/toml11/comments.hpp:4,
                 from /root/.sw/storage/pkg/03/34/516e/src/sdir/include/toml.hpp:28,
                 from /__w/sw/sw/src/sw/driver/driver.cpp:28:
/root/.sw/storage/pkg/03/34/516e/src/sdir/include/toml11/fwd/comments_fwd.hpp: In function 'std::ostream& toml::operator<<(std::ostream&&, const discard_comments&)':
/root/.sw/storage/pkg/03/34/516e/src/sdir/include/toml11/fwd/comments_fwd.hpp:447:85: error: cannot bind non-const lvalue reference of type 'std::ostream&' {aka 'std::basic_ostream<char>&'} to an rvalue of type 'std::ostream' {aka 'std::basic_ostream<char>'}
  447 | inline std::ostream& operator<<(std::ostream&& os, const discard_comments&) {return os;}

It seems this should be https://github.com/ToruNiina/toml11/blob/main/include/toml11/fwd/comments_fwd.hpp#L447
std::ostream& os not std::ostream&& os.

[ToruNiina]

Oops, it is definitely a mistake. And the change you suggested looks correct. Do you want to make a pull request? If you don't want to, then just ignore this comment. I will wait until the weekend.

[egorpugin]

#248

[ToruNiina]

Merged. Thank you!