[plt-scheme] #lang at-exp scheme/base doesn't work?

I ran this:

#lang at-exp scheme/base

(define (greet who) @string-append{Hello, @|who|.})

@greet{world}

I got this:

Welcome to DrScheme, version 4.2.2.4-svn5oct2009 [3m].
Language: Module.
"Hello, world."
 >

What are you doing?


On Oct 11, 2009, at 3:36 AM, ccwu wrote:

> Hi,
>
> I'm learning scheme and scribble using plt-scheme 4.2.2.
> I tried the following code:
>
>  #lang at-exp scheme/base
>
>  (define (greet who) @string-append{Hello, @|who|.})
>
> But drscheme give me an error:
>  unquote: not in quasiquote in: (unquote @who.)
>
> Any idea?
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