[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 sjamaan):

 A good alternative might be to create a distinct new type (either a record
 type or an actual new primitive type, if there are still tag bits left and
 we want to sacrifice one for this) to distinguish "drop this value" from
 other types of returns. This is also backwards-compatible and doesn't
 require MV or other nasty tricks.

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Ticket URL: <http://bugs.call-cc.org/ticket/505#comment:1>
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