Re: [ANN] Lua 5.2.0 (beta-rc5) now available

[Roberto Ierusalimschy <roberto@...>]

> On Tuesday, July 5, 2011, Roberto Ierusalimschy <roberto@inf.puc-rio.br> wrote:
> > How many scripts do you think will fail with this addition of '\x'?
> 
> Related: Approx 1% of scripts use undefined escape sequences:
> http://lua-users.org/lists/lua-l/2010-10/msg00449.html

None of them use '\x' or '\u'.

Both '\[' and '\]' were legal in 5.0.

A common case is '\?'. I remember that there were talks about adding
this as an official escape sequence (meaning '?'), but I do not remember
why. I could not find it in any manual, but since 1998/03/20 (Lua 3.1)
the source code has assumed that it is valid:

** $Id: llex.c,v 1.18 1998/03/20 14:18:18 roberto Exp $

                case '\\': case '"': case '\'': case '?': {
                  save(LS->current);
                  next(LS);
                  break;
                }


** $Id: llex.c,v 2.49 2011/06/23 14:54:48 roberto Exp $

              c = ls->current;  /* handles \\, \", \', and \? */


-- Roberto