[Chicken-janitors] #315: make parameters settable

[Chicken Trac]

#315: make parameters settable
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 Reporter:  felix                     |       Owner:       
     Type:  enhancement               |      Status:  new  
 Priority:  not urgent at all         |   Milestone:       
Component:  core libraries            |     Version:  4.5.x
 Keywords:  srfi-17 setter parameter  |  
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 Allow `(set! (<parameter-name>) <value>)`.

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Ticket URL: <https://bugs.call-cc.org/ticket/315>
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