I think Associative Array should throw Exception

[Jesse Phillips]

On Tuesday, 1 September 2020 at 18:55:20 UTC, Steven 
Schveighoffer wrote:
> On 9/1/20 2:20 PM, Jesse Phillips wrote:
>
>> Using RangeError is nice as it allows code to use array index 
>> inside `nothrow.`
>
> This is the big sticking point -- code that is nothrow would no 
> longer be able to use AAs. It makes the idea, unfortunately, a 
> non-starter.
>
> What is wrong with using `in`? I use this mostly:
>
> if(auto v = key in aa) { /* use v */ }
>

I think that actually might be my point. If you need nothrow then 
this is what you need to do.

For breaking nothrow code using the [] syntax, I'd say it is 
already broken because the behavior is to throw and the above is 
how you would check that it won't.

The issue is, associative arrays throw an "uncatchable" error. 
Meaning code is written to catch the error (because it works). 
And correctly written `nothrow` code needs to use `in` to be 
properly nothrow.