[Issue 5207] Immutability is broken in constructors

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=5207

--- Comment #11 from Nick Treleaven <nick at geany.org> ---
(In reply to hsteoh from comment #7)
> immutable S s;
> immutable S* ptr;
> 
> shared static this() {
> 	ptr = &s;
> 
> 	writeln(ptr.x); // prints 0
> 
> 	s.x = 1;

Interestingly, if it worked like struct/class constructors, you would get an
error:

struct S
{
    immutable int x;
    immutable int* p;
    this(int)
    {
        p = &x; // compiler counts this as initializing x!
        x = 5; // Error: immutable field `x` initialized multiple times
    }
}

It also says 'Previous initialization is here.' for the `p = &x` line.

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