[New feature] Rule to check useless string concatenation

[david-maison]

Can a rule to check for useless string concatenation be useful?

Example:

let s =
  "a string very very very very very very very short " ^
  "that I split in two in order to not go over 80chars per line"

(* instead of *)
let s =
  "a string very very very very very very very short \
   that I split in two in order to not go over 80chars per line"

(Or maybe the OCaml compiler already optimizes that kind of things?)