Re: Could we have elegant version requirement from 5.3 on?

["Thiago L." <fakedme@...>]

On 26/03/2014 05:08, Thomas Jericke wrote:
> On 03/26/2014 06:53 AM, Luiz Henrique de Figueiredo wrote:
> > > We could equally well ignore all leading `#` lines and tag some of
> > > them as expressions to be asserted _before_ proceeding to lexical
> > > analysis of the file.
> > This is easily done with a custom reader function for load.
> Wouldn't that mean you would have to replace the loader in the code 
> being loaded. The only solution I see is to have a wrapper code around 
> the actual code.
>
> But than you could also just write:
>
> if _VERSION ~= "Lua 5.3" then
>     error "This code needs Lua 5.3"
> else
>     load [[
> Do()
> Some()
> Stuff()
> ]]
>
> But I think that has some disadvantages too. Like losing the file name 
> and lines in the debug info. It seems to me that something like a 
> static assert would be the right thing here.

Something like this should work: (as you can see, the first line of the 
module is on the first line of the file, etc)

if _VERSION ~= "Lua 5.3" then error "whatever" end local f,e = load([[ 
FIRST LINE OF CODE HERE
etc
etc
]],"filename.lua")
if not f then error(e) else stuff() end