String substitution and raw string literals aren’t really that closely connected. I’d also suggest that if string substitution becomes nice it will get used far

String substitution and raw string literals aren’t really that closely connected. I’d also suggest that if string substitution becomes nice it will get used far more, so it needs to be implemented in a way that constant folds things nicely. So if I had to guess it might get looked at after the work being done on constants.