Magical values, tied values, and references can be made into
constants at compile time, allowing for way cool stuff like this.
+(These error numbers aren't totally portable, alas.)
use constant E2BIG => ($! = 7);
print E2BIG, "\n"; # something like "Arg list too long"
#=======================================================================
# Some of this stuff didn't work in version 5.003, alas.
-require 5.003_20;
+require 5.003_96;
#=======================================================================
# import() - import symbols into user's namespace