How can we make it easier to experiment with the compiler?

[Basile B.]

On Tuesday, 25 May 2021 at 00:03:56 UTC, Walter Bright wrote:
> On 5/24/2021 2:01 PM, Max Haughton wrote:
>> Where do you start?
>
> At the first function you notice that has poor/missing/wrong 
> documentation.
>
> Like this one I just did:
>
> https://github.com/dlang/dmd/pull/12570

Related, all the BUG:, TODO:, etc. comments should be moved to 
bugzilla.
For example 
[here](https://github.com/dlang/dmd/blob/7fafcd213ac82c58e7b8fb8143c837c7595c4e8f/src/dmd/expressionsem.d#L10140)

```d
/* BUG: Should handle things like:
  *      char c;
  *      c ~ ' '
  *      ' ' ~ c;
  */
```

this is an request to have `char() ~ char()` producing `char[]`.
This has nothing to do in the code.