nim compile --run server.nim
Hint: used config file '/usr/local/Cellar/nim/0.20.2/nim/config/nim.cfg' [Conf]
...
/nim/nimSocks/nimSocks/server.nim(144, 77) template/generic instantiation of async from here
/nim/nimSocks/nimSocks/server.nim(211, 5) Error: invalid else, all cases are already covered
Nim Compiler Version 0.20.2 [MacOSX: amd64]
Help the nim novice, please