Problem with coroutine.running?

[Nick Gammon <nick@...>]

The documentation for coroutine.running says this:

"Returns the running coroutine, or nil when called by the main thread."



But it doesn't actually do that. For example:



type (coroutine.running ()) -->  bad argument #1 to 'type' (value  
expected)



Looking at the code, it actually returns no value, when called by the  
main thread.



I suggest that either the code does a "lua_pushnil" or the  
documentation be amended.



- Nick Gammon