Did they mean "." or ":"?

[Christopher Eykamp <chris@...>]

I'm working on a C++ game that uses Lua scripts to control robot 
players.  I'm noticing a common error that the scripters are making, and 
am looking for a way to detect it and print a helpful error message.

When the scripters should be writing:

bot:setAngle(angle)

they often write:

bot.setAngle(angle)

which looks similar but is of course very different.  However, anyone 
with much experience in Java, C++, etc., is conditioned to see the 
second (wrong) version as right, so this is a very difficult bug to 
detect while reading the code.

In the setAngle function, I check that the correct number of parameters 
is passed, and I generate an error message if that happens.  What I'd 
like to do is augment that mechanism by checking if the user used the 
"." variant and display a different message that suggests they verify 
that they meant to use "." and not ":".

Is there a way from C++ to figure out if a function was called using "." 
as opposed to ":"?

Thanks!