how stringize/serialize flush code?

i wish means lambda/proc flush code, serialize i disk, following govern lambda later. arrange like...

x = 40
f = lambda { |y| x + y }
save_for_later(f)

later, removed run flush interpreter, i wish means say...

f = load_from_before
z = f.call(2)
z.should == 42

marshal.dump does work procs. i know perl , lisp trivial. nonetheless there proceed ruby? words, doing save_for_later?

edit: nice, nonetheless does tie over giveaway variables (like x) serialize along lambda. instance ...

x = 40
s = save_for_later { |y| x + y }
# => "lambda { |y|\n  (x + y)\n}"

... twine cost does consolidate construction x. there fortitude takes account, maybe serializing representation table? opening ruby?

edit 2: i updated answer incorporate serializing internal variables. seems acceptable.