Feature to get or add value to an associative array.

[Giles Bathgate]

On Tuesday, 17 April 2018 at 16:18:32 UTC, Nick Treleaven wrote:
> I called the function `slot` because it always returns the 
> address of the slot which the value is stored in.

I like the name. I think your version is quite low level which 
ultimately provides more power at the expense of making the 
callee code less clean. I am not sure with D which of those two 
aspects is preferred. Perhaps both functions could be provided? 
What is the use case for knowing whether a value was inserted.