Create a coroutine to run plans

luprex/core/cpp/traceback.hpp

@@ -15,17 +15,10 @@
 
 // traceback_coroutine
 //
-// Given a coroutine and an error message, returns a traceback
-// of the coroutine.
+// Given a coroutine which contains an error message, pop the error
+// message from the coroutine, and push a traceback onto L.
 //
-int traceback_coroutine(lua_State *L);
-
-// traceback_handler
-//
-// The function 'pcall' expects you to pass in a message handler routine.
-// 'traceback_handler' is designed to be used as this argument to pcall.
-//
-int traceback_handler(lua_State *L);
+void traceback_coroutine(lua_State *L, lua_State *CO);
 
 // traceback_pcall
 //