DIP 1027--String Interpolation--Final Review Discussion Thread

[FeepingCreature]

On Wednesday, 5 February 2020 at 09:11:20 UTC, Walter Bright 
wrote:
> On 2/4/2020 9:48 PM, FeepingCreature wrote:
>> This may sound trivial, but trivial syntax enhancements 
>> matter, especially for a "top-ten" feature like format strings.
>
> It's a fair point, but there's a cost to supporting this. 
> Nothing comes for free, and supporting everything is not 
> practical.

Okay, what actually is the cost of lowering to a template 
instantiation returning a type with an alias to a tuple, compared 
to lowering directly to a tuple? Is this significantly harder to 
implement and support?