> So, the suggestion is: All coroutines in the VM should be implicitly closed on VM exit.
coroutine.wrap closes them automatically [4]
[4] The code
```
local thread = coroutine.wrap(function()
local please <close> = setmetatable({}, {__close = function()
print"coroutine toclose"
end})
error"an error in the goroutine"
print"coroutine ends"
end)
thread()
print"program exit"
```
prints "coroutine toclose" before quitting with an error.
Yes, if an error is raised, the coroutine is correctly closed.
But not every code raises an error :-)
local thread = coroutine.wrap(function()
local please <close> = setmetatable({}, {__close = function()
print"coroutine toclose"
end})
print"coroutine yields"
coroutine.yield()
print"coroutine ends"
end)
thread()
print"program exit"
I don't see "coroutine toclose" printed.
The Lua manual says we should invoke coroutine.close().
But we can't :-)
