Deep vs. shallow copy?

[random832 at fastmail.us]

On Thu, Mar 13, 2014, at 11:28, Rustom Mody wrote:
> Heh! I was hesitating to put that line at all: For one thing its a
> hackneyed truth in the non-FP community. For another, in practical
> Haskell, use of frank recursion is regarded as as sign of programming
> immaturity:

And IIRC Lisp and Scheme have loop macros (whose semantics are more like
a goal seek than iteration IIRC).