[Issue 24211] Const nested function can mutate context

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24211

Basile-z <b2.temp at gmx.com> changed:

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--- Comment #1 from Basile-z <b2.temp at gmx.com> ---
Yes this is like 16248. I dont remember exactly why I had closed that issue,
maybe after a NG discussion where I've been explained that in this case `const`
is a noop.

Anyway, the fact that `immutable` is threated differently is a strong argument
indicating that something should be done for `const` too.

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