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todo.rkt (377B)

      1 #lang racket
      2 
      3 (module m racket
      4   (require syntax/parse
      5            syntax/parse/experimental/template)
      6   (provide (rename-out [template syntax]
      7                        [quasitemplate quasisyntax])
      8            (all-from-out syntax/parse
      9                          syntax/parse/experimental/template)))
     10 
     11 (require 'm)
     12 
     13 (syntax-parse #'(a b)
     14   [(x (~optional y) z)
     15    #'(x (?? y 1) z)])