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$ circle --version
circle version 1.0.0-161
  Circle public preview build 161
  Built Feb 23 2022 11:54:40
  (c) 2022 Sean Baxter
  https://www.circle-lang.org/
  Twitter: @seanbax
$ cat test.cpp
#include<filesystem>
int main(){
  std::filesystem::directory_iterator it{"/tmp"};
}
$ circle -std=c++17 test.cpp
/usr/bin/ld: /tmp/circle-tmp-dir-WxL1d5/test.o: in function `main':
test.cpp:(.text+0x5a): undefined reference to `std::__shared_ptr<std::filesystem::__cxx11::_Dir, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr()'
error: linker failed with exit code 1

Surprising bug. Circle sees this extern template declaration and therefore doesn't do implicit instantiation of the destructor: fs_dir.h:

  // Use explicit instantiations of these types. Any inconsistency in the
  // value of __default_lock_policy between code including this header and
  // the library will cause a linker error.
  extern template class
    __shared_ptr<filesystem::_Dir>;

I'll check it out.