[Chicken-janitors] #504: define-syntax in begin-for-syntax body ineffective

[Chicken Trac]

#504: define-syntax in begin-for-syntax body ineffective
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 Reporter:  felix                           |       Owner:  felix
     Type:  defect                          |      Status:  new  
 Priority:  major                           |   Milestone:  4.7.0
Component:  expander                        |     Version:  4.6.x
 Keywords:  define-syntax begin-for-syntax  |  
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 `(begin-for-syntax (define-syntax ...))` doesn't seem to work. I assume
 this is caused by the use of `parameterize` in `eval/meta` (eval.scm):
 restoring `##sys#macro-environment` drops any new syntax definitions made.

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Ticket URL: <https://bugs.call-cc.org/ticket/504>
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