Creating a default error handler for lua_pcall

[Lee Hickey <lahickey@...>]

Hi all,

Currently, I add an error handler to the stack each time I call 
lua_pcall, by the usual method of 'insert'ing it at the appropriate 
point. As this gets done very frequently, I want to remove the overhead. 
An obvious way is to put the error handler on the stack once and use its 
absolute stack position in each subsequent call to lua_pcall.
The problem with this is that it is susceptible to any other code that 
inadvertently (or deliberately) changes the stack (lua_settop(L, 0), for 
instance).
Is there a way around this without creating a butchered version of 
lua_pcall? I know at the moment lua_pcall will not accept 
pseudo-indices, but it seems to me that this would be the perfect way of 
solving this issue.
Best Regards,
Lee.