debug.traceback() without message but with level doesn't seem to wok
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- Subject: debug.traceback() without message but with level doesn't seem to wok
- From: Richter, Jörg <Joerg.Richter@...>
- Date: 2011年6月10日 13:35:27 +0000
I have problems using debug.traceback() with level but without message argument.
The reference manual seems to indicate that both arguments are optional:
debug.traceback ([thread,] [message] [, level])
But the following script demonstrates that it seems impossible to use debug.traceback() this way:
------8<------
#!/usr/bin/env lua
local c = coroutine.create( function() coroutine.yield() end )
coroutine.resume(c)
print( "()\n",debug.traceback() )
print( "('msg')\n",debug.traceback('msg') )
print( "(2)\n",debug.traceback(2) )
print( "('msg',2)\n",debug.traceback('msg',2) )
print( "(nil,2)\n",debug.traceback(nil,2) )
print( "(c)\n",debug.traceback(c) )
print( "(c,'msg')\n",debug.traceback(c,'msg') )
print( "(c,1)\n",debug.traceback(c,1) )
print( "(c,'msg',1)\n",debug.traceback(c,'msg',1) )
print( "(c,nil,1)\n",debug.traceback(c,nil,1) )
------8<------
Output:
------8<------
()
stack traceback:
./traceback.lua:6: in main chunk
[C]: ?
('msg')
msg
stack traceback:
./traceback.lua:7: in main chunk
[C]: ?
(2)
2
stack traceback:
./traceback.lua:8: in main chunk
[C]: ?
('msg',2)
msg
stack traceback:
[C]: ?
(nil,2)
nil
(c)
stack traceback:
[C]: in function 'yield'
./traceback.lua:3: in function <./traceback.lua:3>
(c,'msg')
msg
stack traceback:
[C]: in function 'yield'
./traceback.lua:3: in function <./traceback.lua:3>
(c,1)
1
stack traceback:
[C]: in function 'yield'
./traceback.lua:3: in function <./traceback.lua:3>
(c,'msg',1)
msg
stack traceback:
./traceback.lua:3: in function <./traceback.lua:3>
(c,nil,1)
nil
------8<------
Is this a issue with the reference manual or with the implementation?
Thanks,
Jörg