[Chicken-janitors] Re: #505: permit user-defined read-syntax to restart the reader

[Chicken Trac]

#505: permit user-defined read-syntax to restart the reader
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  Reporter:  zbigniew        |       Owner:  zbigniew             
      Type:  enhancement     |      Status:  new                  
  Priority:  minor           |   Milestone:  4.7.0                
 Component:  core libraries  |     Version:  4.6.x                
Resolution:                  |    Keywords:  don't fear the reader
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Comment(by zbigniew):

 Final comment, I hope.
 The 0-values solution assumes the reader {{{(readrec)}}} will be reinvoked
 in tail-position.  However, many of the existing read-syntax definitions
 in the reader perform a non-tail call to {{{(readrec)}}}, for example:
 {{{quote quasiquote #$ #` #+}}} and even {{{#;}}}.  Are these recursive
 calls equivalent to {{{(read p)}}}?  If so, users can just call that.  I
 assume it is so, and that the direct call to {{{readrec}}} is just an
 optimization there.  But if not, the functionality should be available to
 users.

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Ticket URL: <http://bugs.call-cc.org/ticket/505#comment:5>
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