On 22 May 2005 14:17, Jim Apple wrote:
Simon Peyton Jones wrote:
- For command-line 'let' and 'x-e' forms, if exactly one variable
is bound, we print its value if it is Showable and not ()
prompt let x = 4 4
prompt x - return 5
5
prompt let ones = [1:x]
What am I to do if I want ones set, but not printed?
I think you mean
let ones = 1:ones
but it's a good point. At the moment you can hack around it with
let ones = 1:ones; x=x
(for example).
Simon: I think let bindings should be exempt from the new auto-show
behaviour. The docs currently say that let doesn't evaluate its rhs:
An important difference between the two types of binding is that the
monadic bind (p - e) is strict (it evaluates e), whereas with the let
form, the expression isn't evaluated immediately:
and the example that follows that paragraph is currently wrong (the let
binding will yield an exception).
Cheers,
Simon
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