Uncallable delegates

[Walter Bright]

On 4/1/2026 7:29 AM, Dukc wrote:
> I have (finally) finished my DIP draft for the [Delegates and qualifier 
> transitivity](https://forum.dlang.org/thread/gbrwklyugksqbpksgmgp@forum.dlang.org) idea discussion.
> 
> It can be found 
> [here](https://gist.github.com/dukc/0ede11a0fcb77b2ff92654ceaa7805e2), and is 
> awaiting your feedback.

Calling std library functions makes the DIP harder to understand. Also, examples 
that contain more than one qualifier become very hard to understand.

A more understandable DIP would deal with only one qualifier at at time - can it 
be implicitly converted or not, and does it apply to the function pointer or the 
context pointer?

Whether such calls can be done in @safe or @system should not be a factor. For 
example, a pointer to a const cannot modify the const in @system code. @system 
code would allow an explicit cast to mutable.