[Issue 13010] Use variable range propagation (VRP) for static assert

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13010

--- Comment #3 from Lionello Lunesu <lio+bugzilla at lunesu.com> ---
(In reply to Kenji Hara from comment #2)
> (In reply to Lionello Lunesu from comment #0)
> > This code should work:
> > 
> > void testvrp(ubyte l)
> > {
> >   immutable int i = l;
> >   static assert(i + 1);
> > }
> 
> To me the code looks very weird, because:
> 
> 1. static assert condition is *always* evaluated in compile time.
> 2. but the expression i + 1 cannot be evaluated at compile time.
> 
> These items are contradict each other, so I think it should not be compiled.
> 
> Could you please show me an *actual* use case of this enhancement?

How do you feel about it when the code is changed to this:

void testvrp(ubyte l)
{
  immutable int i = l;
  static assert(i >= 0);
}

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