[plt-scheme] (v4) wildcard not allowed in expression

[Jos Koot]

May be you missed the fact that _ has become a wild-card.
Jos
  ----- Original Message ----- 
  From: Jos Koot 
  To: YC ; pltscheme 
  Sent: Tuesday, June 24, 2008 2:39 AM
  Subject: Re: [plt-scheme] (v4) wildcard not allowed in expression


  It works for me though:

  #lang scheme

  (define-syntax x
   (syntax-rules ()
    ((_ 1 _) 'one)
    ((_ _ 2) 'two)))

  (x 1 monkey) ; one
  (x monkey 2) ; two

  Welcome to DrScheme, version 4.0.0.1-svn16jun2008 [3m].
  Language: Module.

  Jos
    ----- Original Message ----- 
    From: YC 
    To: pltscheme 
    Sent: Tuesday, June 24, 2008 12:32 AM
    Subject: [plt-scheme] (v4) wildcard not allowed in expression


    Hi - 

    It seems that in v4 `_` can no longer exist in the expression position for syntax-case, is there a reason for the change? 

    Thanks,
    yc




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