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(.using
 [library
  [lux (.except)
   [abstract
    [monad (.only do)]]
   [control
    ["[0]" exception (.only exception:)]]
   [macro
    ["^" pattern]]
   [target
    ["_" ruby]]]]
 ["[0]" /
  [runtime (.only Phase Phase!)]
  ["[1][0]" primitive]
  ["[1][0]" structure]
  ["[1][0]" reference]
  ["[1][0]" function]
  ["[1][0]" case]
  ["[1][0]" loop]
  ["/[1]" //
   ["[1][0]" reference]
   ["/[1]" //
    ["[1][0]" extension (.only)
     [generation
      [ruby
       ["[1]/[0]" common]]]]
    ["/[1]" //
     [analysis (.only)]
     ["[1][0]" synthesis]
     ["//[1]" ///
      ["[1][0]" phase (.open: "[1]#[0]" monad)]
      [reference (.only)
       [variable (.only)]]]]]]])

(exception: .public cannot_recur_as_an_expression)

(def (expression archive synthesis)
  Phase
  (case synthesis
    (^.with_template [<tag> <generator>]
      [(pattern (<tag> value))
       (//////phase#in (<generator> value))])
    ([////synthesis.bit  /primitive.bit]
     [////synthesis.i64  /primitive.i64]
     [////synthesis.f64  /primitive.f64]
     [////synthesis.text /primitive.text])

    (^.with_template [<tag> <generator>]
      [(pattern (<tag> value))
       (<generator> expression archive value)])
    ([////synthesis.variant /structure.variant]
     [////synthesis.tuple /structure.tuple]
     
     [////synthesis.branch/exec /case.exec]
     [////synthesis.branch/let /case.let]
     [////synthesis.branch/if /case.if]
     [////synthesis.branch/get /case.get]
     
     [////synthesis.function/apply /function.apply])

    (^.with_template [<tag> <generator>]
      [(pattern (<tag> value))
       (<generator> ///extension/common.statement expression archive value)])
    ([////synthesis.branch/case /case.case]
     [////synthesis.loop/scope /loop.scope]
     [////synthesis.function/abstraction /function.function])

    (pattern (////synthesis.loop/again _))
    (//////phase.except ..cannot_recur_as_an_expression [])

    {////synthesis.#Reference value}
    (//reference.reference /reference.system archive value)

    {////synthesis.#Extension extension}
    (///extension.apply archive expression extension)))

(def .public generate
  Phase
  ..expression)