The state of string interpolation

[Adam D. Ruppe]

On Thursday, 6 December 2018 at 02:14:12 UTC, Neia Neutuladh 
wrote:
> However, that would also force druntime to include formatting 
> code that it currently lacks.

Not necessarily. There is precedent in the language for a 
built-in feature actually lowering to a Phobos call: the ** 
operator is translated to std.math.pow.

The interpolate thing could very well be translated to a call to 
std.conv.text.