Re: immutable promise broken in unions?

[Tobi G. via Digitalmars-d-learn]

On Saturday, 2 January 2016 at 10:04:47 UTC, Shriramana Sharma 
wrote:

I thought the promise of `immutable` was: never changes.

The compiler doesn't protect you by carrying a bomb. :)

But there is another usecase where it makes sense to allow 
writing to other union members despite the overlap with immutable 
data:

enum Types {Integer, Text, CalculationConstant}

struct oldStyleLimitedBadVariant // Don't use that! D offers 
std.variant.Algebraic..
{
   Types type;
   union
   {
       int integer;
       string text;
       immutable float calculationConstant;
   }
}

There i would expect that i can write to integer and text at any 
time.

togrue