DIP 1027---String Interpolation---Community Review Round 1

[Tove]

On Saturday, 14 December 2019 at 21:22:41 UTC, Walter Bright 
wrote:
> On 12/14/2019 7:07 AM, Steven Schveighoffer wrote:
>> The point is not just to put the expressions where they 
>> belong, but to be less verbose about it. The dance of quotes 
>> and commas is hard to read and hard to write.
>
>     "I ate ",
>      apples,
>     " and ",
>      bananas,
>     " totalling ",
>      apples + bananas,
>     " fruit."
>
> isn't too bad. Formatting, though, won't change the issue with 
> format strings and the disconnect between the arguments and 
> their positions.

Is format strings worth building on?

With UFCS we could create types which control formatting
"pi=", pi.dec(10),
255, " in hex ", 255.hex