Re: [Chicken-janitors] #1297: variables defined inside closure survive beyond closure!

[Chicken Trac]

#1297: variables defined inside closure survive beyond closure!
-----------------------------+---------------------------------
  Reporter:  ai-artisan      |      Owner:
      Type:  change request  |     Status:  new
  Priority:  minor           |  Milestone:  someday
 Component:  core libraries  |    Version:  4.11.0
Resolution:                  |   Keywords:  closure scope begin
-----------------------------+---------------------------------
Changes (by evhan):

 * priority:  critical => minor


Comment:

 Internal definitions are only valid at the start of a body (see
 
[http://www.schemers.org/Documents/Standards/R5RS/HTML/r5rs-Z-H-8.html#%_sec_5.2.2
 R5RS]). You have definitions in invalid locations ({{{begin}}} does not
 open a body), which CHICKEN allows but treats as global assignments.

 The following, where internal definitions are correctly placed, prints 123
 as you expect:
 {{{
 (define test
   (lambda ()
     (if r
         (begin
           (set! r #f)
           (let ()
             (define v 123)
             (test)
             (display v)
             (newline)))
         (let ()
           (define v 234)))))
 }}}

--
Ticket URL: <http://bugs.call-cc.org/ticket/1297#comment:1>
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