I've a question on declaration, I've a problem porting something from 
SML/NJ

In SML/Nj i'd declare

val x= "fgdsgh";

and than

let val x = 2
      val y = x+2
in y end;

The first declaration would overwrite the x which will be used in the 
declaration of y. I've look in the Ocaml manual but I only found 
examples with simultanous declaration like

let x ="dhshdjsa";;

let x =2 and y= x+2 in y;;

which of course delivers a type error, coss x isn't overwritten here. 
How the syntax for non-simultanous declaration?

Thanks

hs

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