[Issue 15129] std.parallelism.parallel doesn't enforce shared-correctness

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15129
Issue 15129 depends on issue 1983, which changed state.

Issue 1983 Summary: Delegates violate const
https://issues.dlang.org/show_bug.cgi?id=1983

           What    |Removed                     |Added
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             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

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