Reflecting commit 14976 on version/4.02:
PR#6211: in toplevel interactive use, bad interaction between uncaught
exceptions and multiple bindings of the form "let x = a let y = b;;".


git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14977 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02