[REBOL] Re: x: :y question
From: joel:neely:fedex at: 3-Feb-2003 8:17
Hi, Bolek,
... or a funny little wrinkle in REBOL syntax.
Boleslav Brezovsky wrote:
> Hi,
>
> is this bug or I do not understand something?
>
> >> a: :+
> >> 1 a 2
> ** Script Error: a expected value2 argument of type: number pair char
> money date time tuple
> ** Near: a 2
>
Apparently REBOL figures out "early" (? perhaps at lexical scan ?)
that
(1 + 2)
is equivalent to
(1 + 2)
for predefined words such as '+ and therefore does not make that same
inference for other words simply set to the same internal (op!) value.
>> (+ 1 2)
== 3
>> a: :+
>> type? :a
== op!
>> (a 1 2)
== 3
>> (1 + 2)
== 3
>> (1 a 3)
** Script Error: a expected value2 argument of type:
number pair char money date time tuple
** Near: a 3
However, ALIAS seems to allow a way to "tunnel" around that issue:
>> alias '+ "und"
== und
>> 1 und 2
== 3
As to whether this is a "bug" or not, I don't know whether RT had
intended this inconsistency.
-jn-
