make WWW_Find work again, now that its ML modules reside within a theory context (cf. bf5b45870110) -- patch by Rafal Kolanski;
theory Ex imports Pure
begin
ML {*
val rc = Isabelle_System.bash
"cd \"$ISABELLE_HOME/src/HOL/Library\"; \"$ISABELLE_TOOL\" mirabelle -q arith Inner_Product.thy";
if rc <> 0 then error ("Mirabelle example failed: " ^ string_of_int rc)
else ();
*} -- "some arbitrary small test case"
end