OpenEuphoria

Warnings in Euphoria 2.5

• Posted by "Juergen Luethje" <j.lue at gmx.de> Jan 30, 2005
• 448 views

Hi all,

Euphoria 2.5 has the new feature, that the interpreter parses the whole
program before it starts executing it.
This brings the big advantage, that syntax errors will be found more
reliably than in Eu 2.4 and earlier.

What about the warnings? The following program indicates, that they are
still issued at run-time and not at parse-time:

------------------------[ show.exw ]------------------------
-- run with Eu 2.5 beta
include misc.e

procedure help()
   puts(1, "Usage: exw show.exw <command-line arguments>"
         & "\n\nPress Enter ...\n")
   if getc(0) then end if
   abort(2)
end procedure


constant CMD = command_line()
integer x

if length(CMD) < 3 then
   help()
end if

puts(1, "Command-line arguments are:\n")
pretty_print(1, CMD[3..$], {3})
puts(1, "\n\nPress Enter ...\n")
if getc(0) then end if
------------------------------------------------------------

When I call 'exw show.exw foo bar', then the command-line arguments are
displayed, and after pressing [Enter], the program says
   Warning: local variable x in show.exw is not used
as expected.

But when I just call 'exw show.exw', then the message in procedure help()
is displayed, and the program does not show any warning.

So it can depend on the program flow and the input data, whether or not
a warning is shown. Is it possible/desirable to change the behaviour of
the interpreter, so that causes of warnings are detected at parse-time?

Regards,
   Juergen

-- 
Have you read a good program lately?