[Issue 21821] Optimizer assumes immutables do not change, but they can in @system code

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21821

Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
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            Summary|Optimizer assumes           |Optimizer assumes
                   |immutables don't change,    |immutables do not change,
                   |but they can in @system     |but they can in @system
                   |code                        |code

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