path: root/stdlib/source/documentation/lux.lux

(.module:
  [library
   [lux
    [program {"+" program:}]
    ["$" documentation {"+" documentation:}]
    ["[0]" debug]
    [control
     ["[0]" io]
     ["<>" parser
      ["<[0]>" code]]]
    [data
     ["[0]" text {"+" \n}
      ["%" format {"+" format}]]
     [collection
      ["[0]" list]
      ["[0]" set]]]
    [macro
     ["[0]" template]]]]
  [\\library
   ["[0]" /]]
  ["[0]" / "_"
   ["[1][0]" abstract]
   ["[1][0]" control]
   ["[1][0]" data]
   ["[1][0]" debug]
   ["[1][0]" documentation]
   ["[1][0]" extension]
   ["[1][0]" ffi]
   ["[1][0]" locale]
   ["[1][0]" macro]
   ["[1][0]" math]
   ["[1][0]" meta]
   ["[1][0]" program]
   ["[1][0]" static]
   ["[1][0]" target]
   ["[1][0]" test]
   ["[1][0]" time]
   ["[1][0]" tool] ... TODO: Documentation for this
   ["[1][0]" type]
   ["[1][0]" world]
   ... ["[1][0]" target "_"
   ...  <target>]
   ])

(documentation: /.prelude_module
  (format "The name of the prelude module"
          \n "Value: " (%.text /.prelude_module)))

(documentation: /.Any
  (format "The type of things whose type is irrelevant."
          \n "It can be used to write functions or data-structures that can take, or return, anything."))

(documentation: /.Nothing
  (format "The type of things whose type is undefined."
          \n "Useful for expressions that cause errors or other 'extraordinary' conditions."))

(documentation: (/.List item)
  "A potentially empty list of values.")

(documentation: /.Bit
  "Your standard, run-of-the-mill boolean values (as #0 or #1 bits).")

(documentation: (/.I64 kind)
  "64-bit integers without any semantics.")

(documentation: /.Nat
  (format "Natural numbers (unsigned integers)."
          \n "They start at zero (0) and extend in the positive direction."))

(documentation: /.Int
  "Your standard, run-of-the-mill integer numbers.")

(documentation: /.Rev
  (format "Fractional numbers that live in the interval [0,1)."
          \n "Useful for probability, and other domains that work within that interval."))

(documentation: /.Frac
  "Your standard, run-of-the-mill floating-point (fractional) numbers.")

(documentation: /.Text
  "Your standard, run-of-the-mill string values.")

(documentation: /.Symbol
  (format "A name for a Lux definition."
          \n "It includes the module of provenance."))

(documentation: (/.Maybe value)
  "A potentially missing value.")

(documentation: /.Type
  "This type represents the data-structures that are used to specify types themselves.")

(documentation: /.Location
  "Locations are for specifying the location of Code nodes in Lux files during compilation.")

(documentation: (/.Ann meta_data datum)
  "The type of things that can be annotated with meta-data of arbitrary types.")

(documentation: /.Code
  "The type of Code nodes for Lux syntax.")

(documentation: /.private
  "The export policy for private/local definitions.")

(documentation: /.local
  "The export policy for private/local definitions.")

(documentation: /.public
  "The export policy for public/global definitions.")

(documentation: /.global
  "The export policy for public/global definitions.")

(documentation: /.Definition
  "Represents all the data associated with a definition: its type, its annotations, and its value.")

(documentation: /.Global
  "Represents all the data associated with a global constant.")

(documentation: (/.Either left right)
  "A choice between two values of different types.")

(documentation: /.Module
  "All the information contained within a Lux module.")

(documentation: /.Mode
  "A sign that shows the conditions under which the compiler is running.")

(documentation: /.Info
  "Information about the current version and type of compiler that is running.")

(documentation: /.Lux
  (format "Represents the state of the Lux compiler during a run."
          \n "It is provided to macros during their invocation, so they can access compiler data."
          \n "Caveat emptor: Avoid fiddling with it, unless you know what you're doing."))

(documentation: (/.Meta it)
  (format "Computations that can have access to the state of the compiler."
          \n "These computations may fail, or modify the state of the compiler."))

(documentation: /.Macro
  "Functions that run at compile-time and allow you to transform and extend the language in powerful ways.")

(documentation: /.comment
  (format "Throws away any code given to it."
          \n "Great for commenting-out code, while retaining syntax high-lighting and formatting in your text editor.")
  [(comment
     (def: (this will not)
       (Be Defined)
       (because it will be (commented out))))])

(documentation: /.All
  "Universal quantification."
  [(All (_ a)
     (-> a a))]
  ["A name can be provided, to specify a recursive type."
   (All (List a)
     (Or Any
         [a (List a)]))])

(documentation: /.Ex
  "Existential quantification."
  [(Ex (_ a)
     [(Codec Text a) a])]
  ["A name can be provided, to specify a recursive type."
   (Ex (Self a)
     [(Codec Text a)
      a
      (List (Self a))])])

(documentation: /.->
  "Function types."
  ["This is the type of a function that takes 2 Ints and returns an Int."
   (-> Int Int Int)])

(documentation: /.list
  "List literals."
  [(: (List Nat)
      (list 0 1 2 3))])

(documentation: /.list&
  "List literals, with the last element being a tail-list."
  [(: (List Nat)
      (list& 0 1 2 3
             (: (List Nat)
                (list 4 5 6))))])

(documentation: /.Union
  "Union types."
  [(Union Bit Nat Text)]
  [(= Nothing
      (Union))])

(documentation: /.Tuple
  "Tuple types."
  [(Tuple Bit Nat Text)]
  [(= Any
      (Tuple))])

(documentation: /.Or
  "An alias for the Union type constructor."
  [(= (Union Bit Nat Text)
      (Or Bit Nat Text))]
  [(= (Union)
      (Or))])

(documentation: /.And
  "An alias for the Tuple type constructor."
  [(= (Tuple Bit Nat Text)
      (And Bit Nat Text))]
  [(= (Tuple)
      (And))])

(documentation: /._$
  "Left-association for the application of binary functions over variadic arguments."
  [(_$ text#composite "Hello, " name ". How are you?")
   "=>"
   (text#composite (text#composite "Hello, " name) ". How are you?")])

(documentation: /.$_
  "Right-association for the application of binary functions over variadic arguments."
  [($_ text#composite "Hello, " name ". How are you?")
   "=>"
   (text#composite "Hello, " (text#composite name ". How are you?"))])

(documentation: /.if
  "Picks which expression to evaluate based on a bit test value."
  [(if #1
     "Oh, yeah!"
     "Aw hell naw!")
   "=>"
   "Oh, yeah!"]
  [(if #0
     "Oh, yeah!"
     "Aw hell naw!")
   "=>"
   "Aw hell naw!"])

(documentation: /.Primitive
  "Macro to treat define new primitive types."
  [(Primitive "java.lang.Object")]
  [(Primitive "java.util.List" [(Primitive "java.lang.Long")])])

(documentation: /.`
  (format "Hygienic quasi-quotation as a macro."
          \n "Unquote (~) and unquote-splice (~+) must also be used as forms."
          \n "All unprefixed macros will receive their parent module's prefix if imported; otherwise will receive the prefix of the module on which the quasi-quote is being used.")
  [(` (def: (~ name)
        (function ((~' _) (~+ args))
          (~ body))))])

(documentation: /.`'
  (format "Unhygienic quasi-quotation as a macro."
          \n "Unquote (~) and unquote-splice (~+) must also be used as forms.")
  [(`' (def: (~ name)
         (function (_ (~+ args))
           (~ body))))])

(documentation: /.'
  "Quotation as a macro."
  [(' YOLO)])

(documentation: /.|>
  "Piping macro."
  [(|> elems
       (list#each int#encoded)
       (interposed " ")
       (mix text#composite ""))
   "=>"
   (mix text#composite ""
        (interposed " "
                    (list#each int#encoded
                               elems)))])

(documentation: /.<|
  "Reverse piping macro."
  [(<| (mix text#composite "")
       (interposed " ")
       (list#each int#encoded)
       elems)
   "=>"
   (mix text#composite ""
        (interposed " "
                    (list#each int#encoded
                               elems)))])

(documentation: /.template
  ""
  ["By specifying a pattern (with holes), and the input data to fill those holes, repeats the pattern as many times as necessary."
   (template [<name> <diff>]
     [(def: .public <name>
        (-> Int Int)
        (+ <diff>))]
     
     [++ +1]
     [-- -1]
     )])

(documentation: /.not
  "Bit negation."
  [(not #1)
   "=>"
   #0]
  [(not #0)
   "=>"
   #1])

(documentation: /.type
  "Takes a type expression and returns its representation as data-structure."
  [(type (All (_ a)
           (Maybe (List a))))])

(documentation: /.:
  "The type-annotation macro."
  [(: (List Int)
      (list +1 +2 +3))])

(documentation: /.:as
  "The type-coercion macro."
  [(:as Dinosaur
        (list +1 +2 +3))])

(documentation: /.Rec
  "Parameter-less recursive types."
  ["A name has to be given to the whole type, to use it within its body."
   (Rec Int_List
     (Or Any
         [Int Int_List]))]
  ["Can also be used with type: and labelled-type definitions."
   (type: Type
     (Rec @
       (Variant
        {#Primitive Text (List @)}
        {#Sum @ @}
        {#Product @ @}
        {#Function @ @}
        {#Parameter Nat}
        {#Var Nat}
        {#Ex Nat}
        {#UnivQ (List @) @}
        {#ExQ (List @) @}
        {#Apply @ @}
        {#Named Symbol @})))])

(documentation: /.exec
  "Sequential execution of expressions (great for side-effects)."
  [(exec
     (log! "#1")
     (log! "#2")
     (log! "#3")
     "YOLO")])

(documentation: /.case
  (format "The pattern-matching macro."
          \n "Allows the usage of macros within the patterns to provide custom syntax.")
  [(case (: (List Int)
            (list +1 +2 +3))
     {#Item x {#Item y {#Item z {#End}}}}
     {#Some ($_ * x y z)}

     _
     {#None})])

(documentation: /.^
  (format "Macro-expanding patterns."
          \n "It's a special macro meant to be used with 'case'.")
  [(case (: (List Int)
            (list +1 +2 +3))
     (^ (list x y z))
     {#Some ($_ * x y z)}

     _
     {#None})])

(documentation: /.^or
  (format "Or-patterns."
          \n "It's a special macro meant to be used with 'case'.")
  [(type: Weekday
     (Variant
      {#Monday}
      {#Tuesday}
      {#Wednesday}
      {#Thursday}
      {#Friday}
      {#Saturday}
      {#Sunday}))
   
   (def: (weekend? day)
     (-> Weekday Bit)
     (case day
       (^or {#Saturday} {#Sunday})
       #1

       _
       #0))])

(documentation: /.let
  (format "Creates local bindings."
          \n "Can (optionally) use pattern-matching macros when binding.")
  [(let [x (foo bar)
         y (baz quux)]
     (op x y))])

(documentation: /.function
  "Syntax for creating functions."
  [(: (All (_ a b)
        (-> a b a))
      (function (_ x y)
        x))]
  ["Allows for giving the function itself a name, for the sake of recursion."
   (: (-> Nat Nat)
      (function (factorial n)
        (case n
          0 1
          _ (* n  (factorial (-- n))))))])

(documentation: /.def:
  "Defines global constants/functions."
  [(def: branching_exponent
     Int
     +5)]
  ["The type is optional."
   (def: branching_exponent
     +5)]
  [(def: (pair_list pair)
     (-> [Code Code] (List Code))
     (let [[left right] pair]
       (list left right)))]
  ["Can pattern-match on the inputs to functions."
   (def: (pair_list [left right])
     (-> [Code Code] (List Code))
     (list left right))])

(documentation: /.macro:
  "Macro-definition macro."
  [(macro: .public (symbol tokens)
     (case tokens
       (^template [<tag>]
         [(^ (list [_ {<tag> [module name]}]))
          (in (list (` [(~ (text$ module)) (~ (text$ name))])))])
       ([#Symbol])
       
       _
       (failure "Wrong syntax for symbol")))])

(documentation: /.and
  "Short-circuiting 'and'."
  [(and #1 #0)
   "=>"
   #0]
  [(and #1 #1)
   "=>"
   #1])

(documentation: /.or
  "Short-circuiting 'or'."
  [(or #1 #0)
   "=>"
   #1]
  [(or #0 #0)
   "=>"
   #0])

(documentation: /.panic!
  "Causes an error, with the given error message."
  [(panic! "OH NO!")])

(documentation: /.implementation
  "Express a value that implements an interface."
  [(: (Order Int)
      (implementation
       (def: &equivalence
         equivalence)
       (def: (< reference subject)
         (< reference subject))
       ))])

(documentation: /.implementation:
  "Interface implementation."
  [(implementation: .public order
     (Order Int)
     (def: &equivalence
       equivalence)
     (def: (< test subject)
       (< test subject)))])

(documentation: /.Variant
  (format "Syntax for defining labelled/tagged sum/union types."
          \n "WARNING: Only use it within the type: macro.")
  [(type: Referrals
     (Variant
      {#All}
      {#Only (List Text)}
      {#Exclude (List Text)}
      {#Ignore}
      {#Nothing}))])

(documentation: /.Record
  (format "Syntax for defining labelled/slotted product/tuple types."
          \n "WARNING: Only use it within the type: macro.")
  [(type: Refer
     (Record
      [#refer_defs Referrals
       #refer_open (List Openings)]))])

(documentation: /.type:
  "The type-definition macro."
  [(type: (List a)
     {#End}
     {#Item a (List a)})])

(documentation: /.Interface
  "Interface definition."
  [(type: .public (Order a)
     (Interface
      (: (Equivalence a)
         &equivalence)
      (: (-> a a Bit)
         <)))])

(.template [<name>]
  [(documentation: <name>
     "Safe type-casting for I64 values.")]

  [/.i64]
  [/.nat]
  [/.int]
  [/.rev]
  )

(documentation: /.module_separator
  (format "Character used to separate the parts of module names."
          \n "Value: " (%.text /.module_separator)))

(documentation: /.^open
  (format "Same as the 'open' macro, but meant to be used as a pattern-matching macro for generating local bindings."
          \n "Takes an 'alias' text for the generated local bindings.")
  [(def: .public (range enum from to)
     (All (_ a) (-> (Enum a) a a (List a)))
     (let [(^open "[0]") enum]
       (loop [end to
              output {.#End}]
         (cond (< end from)
               (again (pred end) {.#Item end output})

               (< from end)
               (again (succ end) {.#Item end output})

               ... (= end from)
               {.#Item end output}))))])

(documentation: /.cond
  "Conditional branching with multiple test conditions."
  [(cond (even? num) "WHEN even"
         (odd? num) "WHEN odd"
         "ELSE")])

(documentation: /.value@
  "Accesses the value of a record at a given tag."
  [(value@ #field my_record)]
  ["Can also work with multiple levels of nesting."
   (value@ [#foo #bar #baz] my_record)]
  ["And, if only the slot/path is given, generates an accessor function."
   (let [getter (value@ [#foo #bar #baz])]
     (getter my_record))])

(documentation: /.open:
  "Opens a implementation and generates a definition for each of its members (including nested members)."
  [(open: "i:[0]" order)
   "=>"
   (def: i:= (# order =))
   (def: i:< (# order <))])

(documentation: /.|>>
  "Similar to the piping macro, but rather than taking an initial object to work on, creates a function for taking it."
  [(|>> (list#each int#encoded)
        (interposed " ")
        (mix text#composite ""))
   "=>"
   (function (_ <it>)
     (mix text#composite ""
          (interposed " "
                      (list#each int#encoded <it>))))])

(documentation: /.<<|
  "Similar to the reverse piping macro, but rather than taking an initial object to work on, creates a function for taking it."
  [(<<| (mix text#composite "")
        (interposed " ")
        (list#each int#encoded))
   "=>"
   (function (_ <it>)
     (mix text#composite ""
          (interposed " "
                      (list#each int#encoded
                                 <it>))))])

(documentation: /.module:
  "Module-definition macro."
  [(.module:
     [lux "*"
      [control
       ["M" monad "*"]]
      [data
       maybe
       ["[0]" name ("[1]#[0]" codec)]]
      [macro
       code]]
     [//
      [type ("[0]" equivalence)]])])

(documentation: /.#
  "Allows accessing the value of a implementation's member."
  [(# codec encoded)]
  ["Also allows using that value as a function."
   (# codec encoded +123)])

(documentation: /.with@
  "Sets the value of a record at a given tag."
  [(with@ #name "Lux" lang)]
  ["Can also work with multiple levels of nesting."
   (with@ [#foo #bar #baz] value my_record)]
  ["And, if only the slot/path and (optionally) the value are given, generates a mutator function."
   (let [setter (with@ [#foo #bar #baz] value)]
     (setter my_record))
   (let [setter (with@ [#foo #bar #baz])]
     (setter value my_record))])

(documentation: /.revised@
  "Modifies the value of a record at a given tag, based on some function."
  [(revised@ #age ++ person)]
  ["Can also work with multiple levels of nesting."
   (revised@ [#foo #bar #baz] func my_record)]
  ["And, if only the slot/path and (optionally) the value are given, generates a mutator function."
   (let [updater (revised@ [#foo #bar #baz] func)]
     (updater my_record))
   (let [updater (revised@ [#foo #bar #baz])]
     (updater func my_record))])

(documentation: /.^template
  "It's similar to template, but meant to be used during pattern-matching."
  [(def: (reduced env type)
     (-> (List Type) Type Type)
     (case type
       {.#Primitive name params}
       {.#Primitive name (list#each (reduced env) params)}

       (^template [<tag>]
         [{<tag> left right}
          {<tag> (reduced env left) (reduced env right)}])
       ([.#Sum] [.#Product])

       (^template [<tag>]
         [{<tag> left right}
          {<tag> (reduced env left) (reduced env right)}])
       ([.#Function] [.#Apply])

       (^template [<tag>]
         [{<tag> old_env def}
          (case old_env
            {.#End}
            {<tag> env def}

            _
            type)])
       ([.#UnivQ] [.#ExQ])

       {.#Parameter idx}
       (else type (list.item idx env))

       _
       type
       ))])

(.template [<name> <doc>]
  [(documentation: <name>
     <doc>)]

  [/.++ "Increment function."]
  [/.-- "Decrement function."]
  )

(documentation: /.loop
  (format "Allows arbitrary looping, using the 'again' form to re-start the loop."
          \n "Can be used in monadic code to create monadic loops.")
  [(loop [count +0
          x init]
     (if (< +10 count)
       (again (++ count) (f x))
       x))]
  ["Loops can also be given custom names."
   (loop my_loop
     [count +0
      x init]
     (if (< +10 count)
       (my_loop (++ count) (f x))
       x))])

(documentation: /.with_expansions
  (format "Controlled macro-expansion."
          \n "Bind an arbitraty number of Code nodes resulting from macro-expansion to local bindings."
          \n "Wherever a binding appears, the bound Code nodes will be spliced in there.")
  [(def: test
     Test
     (with_expansions
       [<tests> (template [<function> <parameter> <expected>]
                  [(cover [<function>]
                          (compare <text>
                                   (# codec encoded <function> <parameter>)))]

                  [bit #1                "#1"]
                  [int +123              "+123"]
                  [frac +123.0           "+123.0"]
                  [text "123"            "'123'"]
                  [symbol ["yolo" "lol"] "yolo.lol"]
                  [form (list (bit #1))  "(#1)"]
                  [tuple (list (bit #1)) "[#1]"]
                  )]
       ($_ and
           <tests>
           )))])

(documentation: /.static
  (format "Resolves the names of definitions to their values at compile-time, assuming their values are either:"
          \n "* Bit"
          \n "* Nat"
          \n "* Int"
          \n "* Rev"
          \n "* Frac"
          \n "* Text")
  [(def: my_nat 123)
   (def: my_text "456")
   (and (case [my_nat my_text]
          (^ (static [..my_nat ..my_text]))
          true

          _
          false)
        (case [my_nat my_text]
          (^ [(static ..my_nat) (static ..my_text)])
          true

          _
          false))])

(documentation: /.^multi
  (format "Multi-level pattern matching."
          \n "Useful in situations where the result of a branch depends on further refinements on the values being matched.")
  [(case (split (size static) uri)
     (^multi {#Some [chunk uri']}
             [(text#= static chunk) #1])
     (match_uri endpoint? parts' uri')

     _
     {#Left (format "Static part " (%t static) " does not match URI: " uri)})]
  ["Short-cuts can be taken when using bit tests."
   "The example above can be rewritten as..."
   (case (split (size static) uri)
     (^multi {#Some [chunk uri']}
             (text#= static chunk))
     (match_uri endpoint? parts' uri')

     _
     {#Left (format "Static part " (%t static) " does not match URI: " uri)})])

(documentation: /.symbol
  "Gives back a 2 tuple with the module and name parts, both as Text."
  [(symbol ..#doc)
   "=>"
   ["documentation/lux" "#doc"]])

(documentation: /.:parameter
  (format "WARNING: Please stay away from this macro; it's very likely to be removed in a future version of Lux."
          "Allows you to refer to the type-variables in a polymorphic function's type, by their index.")
  ["In the example below, 0 corresponds to the 'a' variable."
   (def: .public (of_list list)
     (All (_ a) (-> (List a) (Row a)))
     (list#mix add
               (: (Row (:parameter 0))
                  empty)
               list))])

(documentation: /.same?
  "Tests whether the 2 values are identical (not just 'equal')."
  ["This one should succeed:"
   (let [value +5]
     (same? value
            value))]
  ["This one should fail:"
   (same? +5
          (+ +2 +3))])

(documentation: /.^@
  "Allows you to simultaneously bind and de-structure a value."
  [(def: (hash (^@ set [member_hash _]))
     (list#mix (function (_ elem acc)
                 (+ acc
                    (# member_hash hash elem)))
               0
               (set.list set)))])

(documentation: /.^|>
  "Pipes the value being pattern-matched against prior to binding it to a variable."
  [(case input
     (^|> value [++ (% 10) (max 1)])
     (foo value))])

(documentation: /.:expected
  "Coerces the given expression to the type of whatever is expected."
  [(: Dinosaur
      (:expected (: (List Nat)
                    (list 1 2 3))))])

(documentation: /.undefined
  (format "Meant to be used as a stand-in for functions with undefined implementations."
          \n "Undefined expressions will type-check against everything, so they make good dummy implementations."
          \n "However, if an undefined expression is ever evaluated, it will raise a runtime error.")
  [(def: (square x)
     (-> Int Int)
     (undefined))])

(documentation: /.:of
  "Generates the type corresponding to a given expression."
  [(let [my_num +123]
     (:of my_num))
   "=="
   Int]
  [(:of +123)
   "=="
   Int])

(documentation: /.template:
  (format "Define macros in the style of template and ^template."
          \n "For simple macros that do not need any fancy features.")
  [(template: (square x)
     (* x x))])

(documentation: /.as_is
  (format "Given a (potentially empty) list of codes, just returns them immediately, without any work done."
          \n "This may seen useless, but it has its utility when dealing with controlled-macro-expansion macros.")
  [(with_expansions [<operands> (as_is 1
                                       2
                                       3
                                       4)]
     ($_ + <operands>))])

(documentation: /.char
  "If given a 1-character text literal, yields the char-code of the sole character."
  [(: Nat
      (char "A"))
   "=>"
   65])

(documentation: /.for
  (format "Selects the appropriate code for a given target-platform when compiling Lux to it."
          \n "Look-up the available targets in library/lux/target.")
  [(def: js
     "JavaScript")
   
   (for ["JVM" (do jvm stuff)
         js (do js stuff)]
        (do default stuff))])

(documentation: /.``
  (format "Delimits a controlled (spliced) macro-expansion."
          \n "Uses a (~~) special form to specify where to expand.")
  [(`` (some expression
             (~~ (some macro which may yield 0 or more results))))])

(documentation: /.^code
  "Generates pattern-matching code for Code values in a way that looks like code-templating."
  [(: (Maybe Nat)
      (case (` (#0 123 +456.789))
        (^code (#0 (~ [_ {.#Nat number}]) +456.789))
        {.#Some number}

        _
        {.#None}))])

(documentation: /.false
  "The boolean FALSE value.")

(documentation: /.true
  "The boolean TRUE value.")

(documentation: /.:let
  "Local bindings for types."
  [(:let [side (Either Int Frac)]
     (List [side side]))])

(documentation: /.try
  ""
  [(: Foo
      (case (: (Either Text Bar)
               (try (: Bar
                       (risky computation which may panic))))
        {.#Right success}
        (: Foo
           (do something after success))

        {.#Left error}
        (: Foo
           (recover from error))))])

(.def: .public documentation
  (.List $.Module)
  ($.module /._
            ""
            [..prelude_module
             ..Any
             ..Nothing
             ..List
             ..Bit
             ..I64
             ..Nat
             ..Int
             ..Rev
             ..Frac
             ..Text
             ..Symbol
             ..Maybe
             ..Type
             ..Location
             ..Ann
             ..Code
             ..private
             ..local
             ..public
             ..global
             ..Definition
             ..Global
             ..Either
             ..Module
             ..Mode
             ..Info
             ..Lux
             ..Meta
             ..Macro
             ..comment
             ..All
             ..Ex
             ..->
             ..list
             ..list&
             ..Union
             ..Tuple
             ..Or
             ..And
             .._$
             ..$_
             ..if
             ..Primitive
             ..`
             ..`'
             ..'
             ..|>
             ..<|
             ..template
             ..not
             ..type
             ..:
             ..:as
             ..Rec
             ..exec
             ..case
             ..^
             ..^or
             ..let
             ..function
             ..def:
             ..macro:
             ..and
             ..or
             ..panic!
             ..implementation
             ..implementation:
             ..Variant
             ..Record
             ..type:
             ..Interface
             ..i64
             ..nat
             ..int
             ..rev
             ..module_separator
             ..^open
             ..cond
             ..value@
             ..open:
             ..|>>
             ..<<|
             ..module:
             ..#
             ..with@
             ..revised@
             ..^template
             ..++
             ..--
             ..loop
             ..with_expansions
             ..static
             ..^multi
             ..symbol
             ..:parameter
             ..same?
             ..^@
             ..^|>
             ..:expected
             ..undefined
             ..:of
             ..template:
             ..as_is
             ..char
             ..for
             ..``
             ..^code
             ..false
             ..true
             ..:let
             ..try
             ($.default (/.Code' w))
             ($.default /.Alias)
             ($.default (/.Bindings key value))
             ($.default /.Ref)
             ($.default /.Scope)
             ($.default /.Source)
             ($.default /.Module_State)
             ($.default /.Type_Context)
             ($.default /.Macro')
             ($.default /.Label)
             ($.default /.macro)]
            [/abstract.documentation
             /control.documentation
             /data.documentation
             /debug.documentation
             /documentation.documentation
             /extension.documentation
             /ffi.documentation
             /locale.documentation
             /macro.documentation
             /math.documentation
             /meta.documentation
             /program.documentation
             /static.documentation
             /target.documentation
             /test.documentation
             /time.documentation
             /tool.documentation
             /type.documentation
             /world.documentation]))

(program: inputs
  (io.io (debug.log! ($.documentation ..documentation))))