[REBOL] Getting a function body block from standard input

[bigalp]

I would like to get a block from "ask" and pass it as a function body
block to "func".

I've tried something like

        print y: make block! ask ["Enter your function "]

        yfunction: func [x] [y]

but this and other variations doesn't seem to work.
I'm new to REBOL. Could someone point me in the right direction?

TIA, AP [:{)