Seems like everybody's proposing const ... so here's another one

[Mike]

Why not keep the simple things simple?

const int simple_pi = 3;

Const, final and invariant have "default" meanings, whatever Walter thinks  
makes the most sense. If you have the need to be specific about constness,  
you use:

const(head: mutable, tail: invariant) [...];

It is aliasable of course.

alias const(head: random, tail: pay-per-view) my_silly_const; // (*)
my_silly_const [...];

What do you think?

-Mike

(*) Disclaimer: I don't mean to be sarcastic, it's just a silly joke  
because it's friday :)

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