Re: silent hang - can anyone explain?

[Matthew Wild <mwild1@...>]

On 16 October 2012 16:12, David Collier <myshkin@cix.co.uk> wrote:
> I mistakenly wrote:
>
>     for charIndex = startIndex, #payLoad
>     do
>         local char = payLoad:subs(charIndex, charIndex)
>
> of course it should have been sub()
>
> my program silently hung - is this an expected consequence of this sort
> of misspelling?

    Lua 5.1.4  Copyright (C) 1994-2008 Lua.org, PUC-Rio
    > mystring = "Hello world"
    > return mystring:subs(1,1)
    stdin:1: attempt to call method 'subs' (a nil value)
    stack traceback:
    	stdin:1: in main chunk
    	[C]: ?

I'll make a guess that you're using Lua inside an application that is
using [lua_]pcall() without appropriate error handling in place to
report the error to you. Another possibility is that the error
happened inside a coroutine, you need to check the return value from
coroutine.resume() in this case.

Regards,
Matthew