coroutine.running

coroutine.running

For PUC-Rio Lua 5.1 the (x)pcall functions use internal coroutines to allow yielding. The compatibility implementations of debug.traceback and coroutine.running take that into account, but if you use the compatibility versions of (x)pcall to execute a function that uses the original versions (e.g. via an upvalue), there could be problems. In the case of debug.traceback the stack trace will be incomplete, but in the case of coroutine.running the wrong coroutine (the one started by (x)pcall) is reported! To mitigate that risk load the compat53 Lua module before all other modules, so that those cannot keep a reference to the original 5.1 functions.