[Issue 9149] Disallow converting delegates to const

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=9149

--- Comment #7 from Sobirari Muhomori <dfj1esp02 at sneakemail.com> ---
(In reply to timon.gehr from comment #0)
> Reading a mutable delegate out of a const reference

For there to be mutable data accessible through a const reference, the const
qualifier should not be transitive?

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