[Issue 18417] Make const and immutable postblit constructors illegal

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18417

anonymous4 <dfj1esp02 at sneakemail.com> changed:

           What    |Removed                     |Added
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           Keywords|                            |spec

--- Comment #2 from anonymous4 <dfj1esp02 at sneakemail.com> ---
Dunno, they can still refer global data?
---
int called;
struct A {
        this(this) immutable { called++; }
}
---

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