Bug in source printer with raw identifiers

[ccasin]

Here's a valid program:

module M = struct
  type \#mod = int
end
type t = M.\#mod

And here's the output of -dsource for this program:

module M = struct type \#mod = int end
type t = M.(mod)

But the second program is rejected by the parser. I tested this on the current head of trunk (ad2aecf).

Credit to @dvulakh for pointing out that I have the same bug in a branch of ocamlformat I'm working on, which caused me to wonder how the compiler's own printer handles this example.

[ccasin]

Thanks for the quick fix, @Octachron !