yield across metamethod/C-call ?

[Valerio Schiavoni <valerio.schiavoni@...>]

Hello everyone,

can anyone explain me what's happening running this simple lua script:

--metaerror.lua

coroutine.create(coroutine.yield())

lua: attempt to yield across metamethod/C-call boundary
stack traceback:
	[C]: in function 'yield'
	/Users/veleno/Downloads/metaerror.lua:1: in main chunk
	[C]: ?

I've searched on google for that error, but many references belong to the interaction between C++ and Lua code. Here it's only Lua.

I agree that that kind of code is not really very useful..but I'd like to understand it.

Thanks,

valerio