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

[Dukc]

On Monday, 24 May 2021 at 02:56:14 UTC, Walter Bright wrote:
> A good rule of thumb is:
>
>     *** Never import a file from an uplevel directory ***
>
> Import sideways and down, never up.

You may want to reconsider what you just said.

Do you really insist that `std.stdio` should copy-paste the CLib 
headers instead of importing `core.stdc.stdio`?