<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=NL-BE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-GB>Hi,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>I have a question relating to syntax-transformers.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>I’m trying to implement my own provide-syntax using <i>make-provide-transformer</i>. The documentation says that it should be possible to use <i>syntax-local-lift-expression </i>to dynamically insert new variables into the module and then export them (see link below), but I really don’t seem to get it working. A somewhat trivial example:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>(define-syntax one-two-three<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB> (make-provide-transformer<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB> (lambda (stx modes)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB> (list (make-export (syntax-lift-expression #’1) ‘one #f #f stx)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB> (make-export (syntax-lift-expression #’2) ‘two #f #f stx) <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB> (make-export (syntax-lift-expression #’3) ‘three #f #f stx)))))<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>(povide (one-two-three))<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Could you by any chance provide me with an example of how the two procedures can be used to achieve this?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Greetings,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-GB>Sam<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB>PS: I’m referring to paragraph two of <a href="http://docs.racket-lang.org/reference/stxtrans.html#(tech._provide._transformer)">http://docs.racket-lang.org/reference/stxtrans.html#(tech._provide._transformer)</a> <o:p></o:p></span></p></div></body></html>