Re: lua_checkstack in Lua 5.0

[Roberto Ierusalimschy <roberto@...>]

> Uncommenting this line leads to a failed assert in traversestack()
> (line:245 / lgc.c) while still in openstdlibs above.

This is a bug :(  The patch is

* lgc.c:
247c247
<     if (!(ci->state & CI_C) && lim < ci->top)
---
>     if (lim < ci->top)


What is happening is that, in a garbage collection, Lua may shrink the
stack more than it should (that is, after the gc the stack may not have
that extra space that you asked).

-- Roberto