Right, the reference Tcl implementation is still in C. This project takes the C code and produces Go, along with a supporting libc emulation in Go. It's still the original C code, not a clone as Jim or Picol.
Thanks for the clarification. I don't use Tcl for normal work anymore (though I still use it for small things), but it still has a very special place in my heart. It's one of my favorite languages to program in.