[Issue 16056] immutable delegate can mutate through context pointer

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16056

--- Comment #3 from ag0aep6g at gmail.com ---
(In reply to Eyal Lotem from comment #2)
> This is simpler -- but this simpler example isn't a bug: a pure func that
> takes a mutable delegate is "weakly pure" because it doesn't take an
> immutable argument. You could say that the simplified pure func takes an
> explicitly mutable argument, so it is known to be weakly pure.

pure_func's parameter isn't mutable. It's explicitly marked immutable.

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