[Chicken-janitors] #379: Complete SRFI-46 support

[Chicken Trac]

#379: Complete SRFI-46 support
-----------------------------------+----------------------------------------
 Reporter:  sjamaan                |       Owner:  felix
     Type:  defect                 |      Status:  new  
 Priority:  minor                  |   Milestone:  4.7.0
Component:  core libraries         |     Version:  4.6.x
 Keywords:  syntax-rules, srfi-46  |  
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 I got bored so I decided to finish srfi-46 support.

 Right now we have support for custom ellipsis identifiers, which is half
 of SRFI-46. It's much simpler to explain that Chicken supports SRFI-46
 than just the ellipsis stuff, and tail patterns provide for slightly more
 powerful macros.

 During my work on it I also found a bug in the way vectors are matched:

 {{{
 (define-syntax foo  (syntax-rules () ((_ #((a) ...)) (list a ...))))
 (foo #((1))) => error. It should return (1)
 }}}

 I just dropped the specialized vector matching and converted vectors to
 list, on match too (it was already done this way for the patterns). This
 solves any vector-specific bugs and also helps keep the code compact. If
 speed is an issue, I also have a version that adds SRFI-46 to the vector-
 specific code.

 If there's a better way to do the take-right and drop-right, I'd be happy
 to hear it.

-- 
Ticket URL: <http://bugs.call-cc.org/ticket/379>
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