The Haskell version of printf does not statically analyse the format string and will raise an exception if the provided arguments are invalid e.g. Prelude

The Haskell version of printf does not statically analyse the format string and will raise an exception if the provided arguments are invalid e.g. Prelude Text.Printf> printf "%d\n" "invalid" *** Exception: printf: bad formatting char 'd' The behaviour of F#'s printfn is hard-coded in the compiler and could not be written in F# iteself.