George,
Your unicode comment made me wonder. So I wrote out some code to the repl
and it "compiled" and ran fine. Next I copied that code to Notepad and then
copied and pasted it back to the repl and it "compiled" and ran fine. Finally
I google "scheme factorial" and copied what I found to the repl and there I had
problems.
First saw this in the arc programming language, which is based on Racket.
The funny thing is that a number of other Scheme implementations do not act
thusly. I wonder what can be done to remove this from Racket.
Steve
---
;; Typed into repl
> (define (fact n)
(if (< n 2)
1
(* n (fact (- n 1)))))
> (fact 5)
120
;; Copied from Notepad into repl> (define (fact n)
(if (< n 2)
1
(* n (fact (- n 1)))))
> (fact 5)
120
;; Copied from browser into repl> (define (factorial n)
(if (= n 0)
1
(* n (factorial (- n 1)))))
stdin::355: if: bad syntax;
has 4 parts after keyword
in: (if (= n 0) 1 R (* n (factorial (- n 1))))
context...:
C:\Program Files\Racket\collects\racket\private\misc.rkt:87:7
>
From: George Neuner <[email protected]>
To: [email protected]
Sent: Tuesday, March 17, 2015 2:21 PM
Subject: Re: [racket] Error when pasting code
On Tue, 17 Mar 2015 19:06:50 +0000 (UTC), Steve Graham
<[email protected]> wrote:
>When running the following code, when manually typed in, there is no
>error. However, when the same is pasted from the keyboard buffer,
>the error indicated appears.
>Comments?
>Thanks, Steve
Likely there are hidden control characters being carried when you cut
and paste.
I've had troubles going back and forth between DrRacket and various
unicode aware code editors - everything from syntax errors compiling
to DrRacket hanging or even crashing trying to load source files.
Inevitably it is because some hidden character(s) snuck in.
I haven't actually experienced it with cut-n-paste, but it would not
surprise me.
George
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