A bare-bones proof of concept implementation of a typesafe printf-like interface where the format string is provided as a type-level string.
This library uses the 0.12 version of the compiler.
format (SProxy :: SProxy "Hi %s! Your favourite number is %d") "Bill" 16
produces the string
"Hi Bill! Your favourite number is 16"
A function of the "right type" is generated from the format string, so that
:t format (SProxy :: SProxy "Hi %s! Your favourite number is %d")
String -> Int -> String
Currently only "%d" and "%s" are supported, without any other fancy formatting.