(r5rs.info.gz) Transformers

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 7.1.5 Transformers
 ------------------
 
 <transformer spec> ->
     (syntax-rules (<identifier>*) <syntax rule>*)
 <syntax rule> -> (<pattern> <template>)
 <pattern> -> <pattern identifier>
      | (<pattern>*)
      | (<pattern>+ . <pattern>)
      | (<pattern>* <pattern> <ellipsis>)
      | #(<pattern>*)
      | #(<pattern>* <pattern> <ellipsis>)
      | <pattern datum>
 <pattern datum> -> <string>
      | <character>
      | <boolean>
      | <number>
 <template> -> <pattern identifier>
      | (<template element>*)
      | (<template element>+ . <template>)
      | #(<template element>*)
      | <template datum>
 <template element> -> <template>
      | <template> <ellipsis>
 <template datum> -> <pattern datum>
 <pattern identifier> -> <any identifier except `...'>
 <ellipsis> -> <the identifier `...'>
 

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