Added an abstraction for interest rates.

16 files changed, 323 insertions, 215 deletions

diff --git a/stdlib/source/test/lux.lux b/stdlib/source/test/lux.lux
index 64ac888ac..5597bded0 100644
--- a/stdlib/source/test/lux.lux
+++ b/stdlib/source/test/lux.lux
@@ -599,35 +599,6 @@
 
                  _
                  false))
-             (_.coverage [/.type_literal]
-               (and (when (/.type_literal [expected/0 expected/1])
-                      {.#Product actual/0 actual/1}
-                      (and (same? expected/0 actual/0)
-                           (same? expected/1 actual/1))
-
-                      _
-                      false)
-                    (when (/.type_literal (/.Or expected/0 expected/1))
-                      {.#Sum actual/0 actual/1}
-                      (and (same? expected/0 actual/0)
-                           (same? expected/1 actual/1))
-
-                      _
-                      false)
-                    (when (/.type_literal (-> expected/0 expected/1))
-                      {.#Function actual/0 actual/1}
-                      (and (same? expected/0 actual/0)
-                           (same? expected/1 actual/1))
-
-                      _
-                      false)
-                    (when (/.type_literal (expected/0 expected/1))
-                      {.#Apply actual/1 actual/0}
-                      (and (same? expected/0 actual/0)
-                           (same? expected/1 actual/1))
-
-                      _
-                      false)))
              (_.coverage [/.type]
                (exec
                  (is /.Type ..for_type/variant)
diff --git a/stdlib/source/test/lux/data/text.lux b/stdlib/source/test/lux/data/text.lux
index fb008dc84..cbe1af77c 100644
--- a/stdlib/source/test/lux/data/text.lux
+++ b/stdlib/source/test/lux/data/text.lux
@@ -90,15 +90,17 @@
  ["[0]" \\format])
 
 (def (equivalence example)
-  (All (_ a) (-> a (Equivalence (\\format.Format a))))
+  (All (_ of)
+    (-> of
+        (Equivalence (\\format.Format of))))
   (implementation
    (def (= reference subject)
      (/#= (reference example) (subject example)))))
 
 (def random_contravariant
-  (Random (Ex (_ a)
-            [(\\format.Format a)
-             (Random a)]))
+  (Random (Ex (_ of)
+            [(\\format.Format of)
+             (Random of)]))
   (all random.either
        (random#in [\\format.bit random.bit])
        (random#in [\\format.nat random.nat])
@@ -153,6 +155,19 @@
                  [\\format.frac_10 frac.decimal random.frac]
                  [\\format.frac_16 frac.hex random.frac]
                  ))
+
+           (,, (with_template [<format> <type>]
+                 [(do random.monad
+                    [it random.safe_frac]
+                    (_.coverage [<format>]
+                      (/.contains? (\\format.int (frac.int (<type> it)))
+                                   (<format> it))))]
+
+                 [\\format.degree frac.degree]
+                 [\\format.percentage frac.percentage]
+                 [\\format.permille frac.permille]
+                 [\\format.permyriad frac.permyriad]
+                 ))
            )))
 
 (def \\format
diff --git a/stdlib/source/test/lux/debug.lux b/stdlib/source/test/lux/debug.lux
index 8c89a23b3..fcba3ec1a 100644
--- a/stdlib/source/test/lux/debug.lux
+++ b/stdlib/source/test/lux/debug.lux
@@ -26,6 +26,7 @@
     [number
      [ratio (.only Ratio)]]]
    [meta
+    ["[0]" type]
     ["[0]" code (.only)
      ["<[1]>" \\parser]]
     [macro
@@ -86,7 +87,7 @@
     [sample_bit random.bit
      sample_int random.int
      sample_frac random.frac]
-    (in (`` (and (when (/.representation (type_literal [Bit Int Frac])
+    (in (`` (and (when (/.representation (type.literal [Bit Int Frac])
                                          [sample_bit sample_int sample_frac])
                    {try.#Success actual}
                    (text#= (format "[" (%.bit sample_bit)
@@ -99,7 +100,7 @@
                    false)
                  ... TODO: Uncomment after switching from the old (tag+last?) to the new (lefts+right?) representation for variants 
                  ... (,, (with_template [<lefts> <right?> <value> <format>]
-                 ...       [(|> (/.representation (type_literal (Or Bit Int Frac))
+                 ...       [(|> (/.representation (type.literal (Or Bit Int Frac))
                  ...                         (is (Or Bit Int Frac)
                  ...                            (<lefts> <right?> <value>)))
                  ...            (try#each (text#= (format "(" (%.nat <lefts>)
@@ -181,11 +182,11 @@
                     (|> (/.representation .Any sample_frac)
                         (try#each (text#= "[]"))
                         (try.else false))
-                    (|> (/.representation (type_literal (List Nat)) (is (List Nat) (list sample_nat)))
+                    (|> (/.representation (type.literal (List Nat)) (is (List Nat) (list sample_nat)))
                         (try#each (text#= (%.list %.nat (list sample_nat))))
                         (try.else false))
                     (,, (with_template [<sample>]
-                          [(|> (/.representation (type_literal (Maybe Nat)) (is (Maybe Nat) <sample>))
+                          [(|> (/.representation (type.literal (Maybe Nat)) (is (Maybe Nat) <sample>))
                                (try#each (text#= (%.maybe %.nat <sample>)))
                                (try.else false))]
                           
diff --git a/stdlib/source/test/lux/meta/compiler/language/lux/analysis/inference.lux b/stdlib/source/test/lux/meta/compiler/language/lux/analysis/inference.lux
index 87b6530d3..b9749422b 100644
--- a/stdlib/source/test/lux/meta/compiler/language/lux/analysis/inference.lux
+++ b/stdlib/source/test/lux/meta/compiler/language/lux/analysis/inference.lux
@@ -134,7 +134,7 @@
                                          analysis/*))))
                     (try.else false))
                 (|> (/.general archive.empty ..analysis
-                               (type_literal (-> type/0 expected))
+                               (type.literal (-> type/0 expected))
                                (list term/0))
                     (//type.expecting expected)
                     (//module.with 0 (product.left name))
@@ -143,7 +143,7 @@
                     (try#each (|>> product.left (type#= expected)))
                     (try.else false))
                 (|> (/.general archive.empty ..analysis
-                               (type_literal {.#Named name (-> type/0 expected)})
+                               (type.literal {.#Named name (-> type/0 expected)})
                                (list term/0))
                     (//type.expecting expected)
                     (//module.with 0 (product.left name))
@@ -152,7 +152,7 @@
                     (try#each (|>> product.left (type#= expected)))
                     (try.else false))
                 (|> (/.general archive.empty ..analysis
-                               (type_literal (All (_ a) (-> a a)))
+                               (type.literal (All (_ a) (-> a a)))
                                (list term/0))
                     (//type.expecting type/0)
                     (//module.with 0 (product.left name))
@@ -163,7 +163,7 @@
                     (try#each (type#= type/0))
                     (try.else false))
                 (|> (/.general archive.empty ..analysis
-                               (type_literal ((All (_ a) (-> a a)) type/0))
+                               (type.literal ((All (_ a) (-> a a)) type/0))
                                (list term/0))
                     (//type.expecting type/0)
                     (//module.with 0 (product.left name))
@@ -173,7 +173,7 @@
                     (try.else false))
                 (|> (do /phase.monad
                       [[@var varT] (//type.check check.var)
-                       _ (//type.check (check.check varT (type_literal (-> type/0 expected))))]
+                       _ (//type.check (check.check varT (type.literal (-> type/0 expected))))]
                       (/.general archive.empty ..analysis varT (list term/0)))
                     (//type.expecting expected)
                     (//module.with 0 (product.left name))
@@ -184,7 +184,7 @@
                     (try#each (type#= expected))
                     (try.else false))
                 (|> (/.general archive.empty ..analysis
-                               (type_literal (Ex (_ a) (-> a a)))
+                               (type.literal (Ex (_ a) (-> a a)))
                                (list (` (.error# ""))))
                     //type.inferring
                     (//module.with 0 (product.left name))
@@ -207,7 +207,7 @@
                     (..fails? /.cannot_infer))))
          (_.coverage [/.cannot_infer_argument]
            (|> (/.general archive.empty ..analysis
-                          (type_literal (-> expected expected))
+                          (type.literal (-> expected expected))
                           (list term/0))
                (//type.expecting expected)
                (//module.with 0 (product.left name))
@@ -267,11 +267,11 @@
                  (variant? {.#Named name variantT} lefts right? tagC)
 
                  cases_independent_of_parameters_conform_to_anything!
-                 (variant? (type_literal (Maybe type/0)) 0 #0 (' []))
+                 (variant? (type.literal (Maybe type/0)) 0 #0 (' []))
 
                  cases_dependent_on_parameters_are_tettered_to_those_parameters!
-                 (and (variant? (type_literal (Maybe type/0)) 0 #1 term/0)
-                      (not (variant? (type_literal (Maybe type/0)) 0 #1 term/1)))
+                 (and (variant? (type.literal (Maybe type/0)) 0 #1 term/0)
+                      (not (variant? (type.literal (Maybe type/0)) 0 #1 term/1)))
 
                  only_bottom_conforms_to_tags_outside_of_range!
                  (`` (and (,, (with_template [<verdict> <term>]
@@ -281,24 +281,24 @@
                                 [#1 (` (.error# ""))]))))
 
                  can_handle_universal_quantification!
-                 (and (variant?' (type_literal (All (_ a) (Maybe a)))
+                 (and (variant?' (type.literal (All (_ a) (Maybe a)))
                                  {.#Some Maybe}
                                  0 #0 (' []))
-                      (variant?' (type_literal (All (_ a) (Maybe a)))
-                                 {.#Some (type_literal (Maybe type/0))}
+                      (variant?' (type.literal (All (_ a) (Maybe a)))
+                                 {.#Some (type.literal (Maybe type/0))}
                                  0 #1 term/0)
-                      (not (variant?' (type_literal (All (_ a) (Maybe a)))
+                      (not (variant?' (type.literal (All (_ a) (Maybe a)))
                                       {.#Some Maybe}
                                       0 #1 term/0)))
 
                  existential_types_do_not_affect_independent_cases!
-                 (variant?' (type_literal (Ex (_ a) (Maybe a)))
+                 (variant?' (type.literal (Ex (_ a) (Maybe a)))
                             {.#None}
                             0 #0 (' []))
 
                  existential_types_affect_dependent_cases!
                  (`` (and (,, (with_template [<verdict> <term>]
-                                [(bit#= <verdict> (variant?' (type_literal (Ex (_ a) (Maybe a))) {.#None} 0 #1 <term>))]
+                                [(bit#= <verdict> (variant?' (type.literal (Ex (_ a) (Maybe a))) {.#None} 0 #1 <term>))]
 
                                 [#0 term/0]
                                 [#1 (` (.error# ""))]))))]
@@ -415,13 +415,13 @@
              ..test|variant
              ..test|record
              (_.coverage [/.invalid_type_application]
-               (and (|> (/.general archive.empty ..analysis (type_literal (type/0 type/1)) (list term/0))
+               (and (|> (/.general archive.empty ..analysis (type.literal (type/0 type/1)) (list term/0))
                         (/phase.result state)
                         (..fails? /.invalid_type_application))
-                    (|> (/.variant lefts right? (type_literal (type/0 type/1)))
+                    (|> (/.variant lefts right? (type.literal (type/0 type/1)))
                         (/phase.result state)
                         (..fails? /.invalid_type_application))
-                    (|> (/.record lefts (type_literal (type/0 type/1)))
+                    (|> (/.record lefts (type.literal (type/0 type/1)))
                         (/phase.result state)
                         (..fails? /.invalid_type_application))))
              ))))
diff --git a/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis.lux b/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis.lux
index 9557ff88b..2b97e44dc 100644
--- a/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis.lux
+++ b/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis.lux
@@ -232,10 +232,10 @@
   (let [state [extension.#bundle (extension/analysis.bundle ..eval)
                extension.#state lux]
         :record: {.#Named [module/0 @text]
-                          (type_literal [.Any .Bit .Nat .Int .Rev .Frac .Text])}
+                          (type.literal [.Any .Bit .Nat .Int .Rev .Frac .Text])}
         slots/* (list @any @bit @nat @int @rev @frac @text)
         :variant: {.#Named [module/0 @text]
-                           (type_literal (Or .Any .Bit .Nat .Int .Rev .Frac .Text))}
+                           (type.literal (Or .Any .Bit .Nat .Int .Rev .Frac .Text))}
         tags/* (list @any @bit @nat @int @rev @frac @text)
 
         can_analyse_unary!
@@ -289,7 +289,7 @@
         (|> (do phase.monad
               [_ (//module.declare_labels true slots/* false :record:)
                .let [:either: {.#Named [module/0 module/0]
-                                       (type_literal (Or .Any :record:))}]
+                                       (type.literal (Or .Any :record:))}]
                _ (//module.declare_labels false (list @left @right) false :either:)
                [:it: it] (|> (code.variant (list (code.local @left)))
                              (/.phase ..expander archive.empty)
@@ -312,7 +312,7 @@
         (|> (do phase.monad
               [_ (//module.declare_labels true slots/* false :record:)
                .let [:either: {.#Named [module/0 module/0]
-                                       (type_literal (Or .Any :record:))}]
+                                       (type.literal (Or .Any :record:))}]
                _ (//module.declare_labels false (list @left @right) false :either:)
                [:it: it] (|> (code.variant (list (code.local @right)
                                                  (` [])
@@ -366,7 +366,7 @@
                                            (code.text text/0)))
                          (/.phase ..expander archive.empty)
                          //type.inferring)]
-          (in (and (type#= (type_literal [.Any .Bit .Nat .Int .Rev .Frac .Text])
+          (in (and (type#= (type.literal [.Any .Bit .Nat .Int .Rev .Frac .Text])
                            :it:)
                    (when it
                      (//.tuple (list (//.unit)
@@ -396,7 +396,7 @@
   (let [state [extension.#bundle (extension/analysis.bundle ..eval)
                extension.#state lux]
         :record: {.#Named [module/0 @text]
-                          (type_literal [.Any .Bit .Nat .Int .Rev .Frac .Text])}
+                          (type.literal [.Any .Bit .Nat .Int .Rev .Frac .Text])}
         slots/* (list @any @bit @nat @int @rev @frac @text)]
     (|> (do phase.monad
           [_ (//module.declare_labels true slots/* false :record:)
@@ -665,11 +665,11 @@
                extension.#state lux]
         
         :variant: {.#Named [module/0 module/0]
-                           (type_literal (Or .Any .Bit .Nat .Int .Rev .Frac .Text))}
+                           (type.literal (Or .Any .Bit .Nat .Int .Rev .Frac .Text))}
         tags/* (list @any @bit @nat @int @rev @frac @text)
 
         :record: {.#Named [module/0 module/0]
-                          (type_literal (And .Any .Bit .Nat .Int .Rev .Frac .Text))}
+                          (type.literal (And .Any .Bit .Nat .Int .Rev .Frac .Text))}
         slots/* (list @any @bit @nat @int @rev @frac @text)
 
         simple!
diff --git a/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/complex.lux b/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/complex.lux
index ba524b22b..1bfc8b7a7 100644
--- a/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/complex.lux
+++ b/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/complex.lux
@@ -184,12 +184,12 @@
                       (//phase#each product.right)
                       (//phase.result state)
                       (try.else false))
-                  (and (sum? (type_literal (Maybe tagT)) 0 false (` []))
-                       (sum? (type_literal (Maybe tagT)) 0 true tagC))
-                  (and (sum? (type_literal (All (_ a) (Maybe a))) 0 false (` []))
-                       (not (sum? (type_literal (All (_ a) (Maybe a))) 0 true tagC)))
-                  (and (sum? (type_literal (Ex (_ a) (Maybe a))) 0 false (` []))
-                       (sum? (type_literal (Ex (_ a) (Maybe a))) 0 true tagC)))))
+                  (and (sum? (type.literal (Maybe tagT)) 0 false (` []))
+                       (sum? (type.literal (Maybe tagT)) 0 true tagC))
+                  (and (sum? (type.literal (All (_ a) (Maybe a))) 0 false (` []))
+                       (not (sum? (type.literal (All (_ a) (Maybe a))) 0 true tagC)))
+                  (and (sum? (type.literal (Ex (_ a) (Maybe a))) 0 false (` []))
+                       (sum? (type.literal (Ex (_ a) (Maybe a))) 0 true tagC)))))
          ... (_.for [/.cannot_analyse_variant]
          ...        (let [failure? (is (All (_ a) (-> (Exception a) (//analysis.Operation Any) Bit))
          ...                           (function (_ exception analysis)
@@ -204,7 +204,7 @@
          ...                      (|> (do //phase.monad
          ...                            [[@var varT] (//type.check check.var)]
          ...                            (|> (/.sum ..analysis lefts right? archive.empty tagC)
-         ...                                (//type.expecting (type_literal (varT tagT)))))
+         ...                                (//type.expecting (type.literal (varT tagT)))))
          ...                          (failure? /.invalid_variant_type))))
          ...               (_.coverage [/.cannot_infer_sum]
          ...                 (|> (do //phase.monad
@@ -326,9 +326,9 @@
                                     (try.else false))))]
              (and (product? productT expected)
                   (product? {.#Named name productT} expected)
-                  (product? (type_literal (Ex (_ a) [a a])) (list term/0 term/0))
-                  (not (product? (type_literal (All (_ a) [a a])) (list term/0 term/0)))
-                  (product? (type_literal (Triple type/0)) (list term/0 term/0 term/0))
+                  (product? (type.literal (Ex (_ a) [a a])) (list term/0 term/0))
+                  (not (product? (type.literal (All (_ a) [a a])) (list term/0 term/0)))
+                  (product? (type.literal (Triple type/0)) (list term/0 term/0 term/0))
                   (|> (do //phase.monad
                         [[@var varT] (//type.check check.var)
                          _ (//type.check (check.check varT productT))
@@ -428,7 +428,7 @@
                                [[@var varT] (//type.check check.var)]
                                (|> expected
                                    (/.product ..analysis archive.empty)
-                                   (//type.expecting (type_literal (varT type/0)))))
+                                   (//type.expecting (type.literal (varT type/0)))))
                              (failure? /.invalid_tuple_type))))))
          )))
 
@@ -651,13 +651,13 @@
              ..test|record
              (_.coverage [/.not_a_quantified_type]
                (and (|> (/.sum ..analysis lefts right? archive.empty term/0)
-                        (//type.expecting (type_literal (type/0 type/1)))
+                        (//type.expecting (type.literal (type/0 type/1)))
                         (//phase.result state)
                         (..failure? /.not_a_quantified_type))
                     (|> types/*,terms/*
                         (list#each product.right)
                         (/.product ..analysis archive.empty)
-                        (//type.expecting (type_literal (type/0 type/1)))
+                        (//type.expecting (type.literal (type/0 type/1)))
                         (//phase.result state)
                         (..failure? /.not_a_quantified_type))))
              ))))
diff --git a/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/function.lux b/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/function.lux
index 2472c55e3..2dcfc22ca 100644
--- a/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/function.lux
+++ b/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/function.lux
@@ -132,11 +132,11 @@
          ...          (function? (Ex (_ a) (-> a a)) term/0)
          ...          (function? (Rec self (-> input/0 self)) $function/0)
 
-         ...          (function? (type_literal ((All (_ a) (-> a a)) output/0)) term/0)
-         ...          (not (function? (type_literal ((All (_ a) (-> a a)) output/1)) term/0))
+         ...          (function? (type.literal ((All (_ a) (-> a a)) output/0)) term/0)
+         ...          (not (function? (type.literal ((All (_ a) (-> a a)) output/1)) term/0))
 
-         ...          (function? (type_literal ((Ex (_ a) (-> a a)) output/0)) term/0)
-         ...          (not (function? (type_literal ((Ex (_ a) (-> a a)) output/1)) term/0))
+         ...          (function? (type.literal ((Ex (_ a) (-> a a)) output/0)) term/0)
+         ...          (not (function? (type.literal ((Ex (_ a) (-> a a)) output/1)) term/0))
 
          ...          (function?' (-> input/0 input/1 input/0) (` ([(, $function/1) (, $argument/1)] (, $argument/0)))
          ...                      (function (_ [outer body])
diff --git a/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/when.lux b/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/when.lux
index f23e99dac..e42a02e2c 100644
--- a/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/when.lux
+++ b/stdlib/source/test/lux/meta/compiler/language/lux/phase/analysis/when.lux
@@ -97,12 +97,12 @@
                           (Tuple (All (_ a b c) input/0)
                                  (All (_ a b c) input/1)
                                  (All (_ a b c) input/2)))
-                  (tuple? (type_literal ((All (_ a b c) (Tuple a b c)) input/0 input/1 input/2))
+                  (tuple? (type.literal ((All (_ a b c) (Tuple a b c)) input/0 input/1 input/2))
                           (Tuple input/0 input/1 input/2))
                   (|> (do check.monad
                         [[@var :var:] check.var
                          _ (check.bind (All (_ a b c) (Tuple a b c)) @var)]
-                        (/.tuple (type_literal (:var: input/0 input/1 input/2))))
+                        (/.tuple (type.literal (:var: input/0 input/1 input/2))))
                       (check.result check.fresh_context)
                       (try#each (|>> product.right (type#= (Tuple input/0 input/1 input/2))))
                       (try.else false))
@@ -127,19 +127,19 @@
                     (exception.otherwise (text.contains? (the exception.#label /.non_tuple))))
                 (|> (do check.monad
                       [[@var :var:] check.var
-                       _ (/.tuple (type_literal (:var: input/0 input/1 input/2)))]
+                       _ (/.tuple (type.literal (:var: input/0 input/1 input/2)))]
                       (in false))
                     (check.result check.fresh_context)
                     (exception.otherwise (text.contains? (the exception.#label /.non_tuple))))
                 (|> (do check.monad
-                      [_ (/.tuple (type_literal (input/0 input/1 input/2)))]
+                      [_ (/.tuple (type.literal (input/0 input/1 input/2)))]
                       (in false))
                     (check.result check.fresh_context)
                     (exception.otherwise (text.contains? (the exception.#label /.non_tuple))))
                 (|> (do check.monad
                       [[@var :var:] check.var
                        _ (check.bind input/0 @var)
-                       _ (/.tuple (type_literal (:var: input/1 input/2)))]
+                       _ (/.tuple (type.literal (:var: input/1 input/2)))]
                       (in false))
                     (check.result check.fresh_context)
                     (exception.otherwise (text.contains? (the exception.#label /.non_tuple))))))
diff --git a/stdlib/source/test/lux/meta/compiler/language/lux/phase/extension/analysis/lux.lux b/stdlib/source/test/lux/meta/compiler/language/lux/phase/extension/analysis/lux.lux
index 66d43c8c6..93ad48d8a 100644
--- a/stdlib/source/test/lux/meta/compiler/language/lux/phase/extension/analysis/lux.lux
+++ b/stdlib/source/test/lux/meta/compiler/language/lux/phase/extension/analysis/lux.lux
@@ -73,7 +73,7 @@
          (_.test "Can 'try' risky IO computations."
            (check_success+ (` .try#)
                            (list (` (.error# "YOLO")))
-                           (type_literal (Either Text primT))))
+                           (type.literal (Either Text primT))))
          )))
 
 (def i64
@@ -149,7 +149,7 @@
          (_.test "Can convert frac number to text."
            (check_success+ (symbol .f64_encoded#) (list subjectC) Text))
          (_.test "Can convert text to frac number."
-           (check_success+ (symbol .f64_decoded#) (list encodedC) (type_literal (Maybe Frac))))
+           (check_success+ (symbol .f64_decoded#) (list encodedC) (type.literal (Maybe Frac))))
          )))
 
 (def text
@@ -168,7 +168,7 @@
          (_.test "Can concatenate one text to another."
            (check_success+ (symbol .text_composite#) (list subjectC paramC) Text))
          (_.test "Can find the index of a piece of text inside a larger one that (may) contain it."
-           (check_success+ (symbol .text_index#) (list fromC paramC subjectC) (type_literal (Maybe Nat))))
+           (check_success+ (symbol .text_index#) (list fromC paramC subjectC) (type.literal (Maybe Nat))))
          (_.test "Can query the size/length of a text."
            (check_success+ (symbol .text_size#) (list subjectC) Nat))
          (_.test "Can obtain the character code of a text at a given index."
diff --git a/stdlib/source/test/lux/meta/compiler/meta/cli/compiler.lux b/stdlib/source/test/lux/meta/compiler/meta/cli/compiler.lux
index c8de9bc39..e4164032a 100644
--- a/stdlib/source/test/lux/meta/compiler/meta/cli/compiler.lux
+++ b/stdlib/source/test/lux/meta/compiler/meta/cli/compiler.lux
@@ -37,7 +37,8 @@
 (def .public test
   Test
   (<| (_.covering /._)
-      (_.for [/.Compiler])
+      (_.for [/.Compiler
+              /.#definition /.#parameters])
       (do [! random.monad]
         [expected ..random]
         (all _.and
diff --git a/stdlib/source/test/lux/meta/type.lux b/stdlib/source/test/lux/meta/type.lux
index 4f02f6fe8..c149f2cc5 100644
--- a/stdlib/source/test/lux/meta/type.lux
+++ b/stdlib/source/test/lux/meta/type.lux
@@ -237,17 +237,17 @@
     [expected ..nominal]
     (all _.and
          (_.coverage [\\parser.recursive]
-           (|> (.type_literal (Rec @ expected))
+           (|> (/.literal (Rec @ expected))
                (\\parser.result (\\parser.recursive \\parser.any))
                (!expect (^.multi {try.#Success [@self actual]}
                                  (/#= expected actual)))))
          (_.coverage [\\parser.recursive_self]
-           (|> (.type_literal (Rec @ @))
+           (|> (/.literal (Rec @ @))
                (\\parser.result (\\parser.recursive \\parser.recursive_self))
                (!expect (^.multi {try.#Success [@expected @actual]}
                                  (same? @expected @actual)))))
          (_.coverage [\\parser.recursive_call]
-           (|> (.type_literal (All (self input) (self input)))
+           (|> (/.literal (All (self input) (self input)))
                (\\parser.result (\\parser.polymorphic \\parser.recursive_call))
                (!expect {try.#Success [@self inputs ???]})))
          (_.coverage [\\parser.not_recursive]
@@ -512,7 +512,7 @@
            (_.coverage [/.by_example]
              (let [example (is (Maybe Nat)
                                {.#None})]
-               (/#= (.type_literal (List Nat))
+               (/#= (/.literal (List Nat))
                     (/.by_example [a]
                       (is (Maybe a)
                           example)
@@ -563,6 +563,35 @@
                     (bit#= (/#= left right)
                            (text#= (/.absolute_format left) (/.absolute_format right))))
                   ))
+           ... (_.coverage [/.literal]
+           ...   (and (when (/.literal [expected/0 expected/1])
+           ...          {.#Product actual/0 actual/1}
+           ...          (and (same? expected/0 actual/0)
+           ...               (same? expected/1 actual/1))
+
+           ...          _
+           ...          false)
+           ...        (when (/.literal (/.Or expected/0 expected/1))
+           ...          {.#Sum actual/0 actual/1}
+           ...          (and (same? expected/0 actual/0)
+           ...               (same? expected/1 actual/1))
+
+           ...          _
+           ...          false)
+           ...        (when (/.literal (-> expected/0 expected/1))
+           ...          {.#Function actual/0 actual/1}
+           ...          (and (same? expected/0 actual/0)
+           ...               (same? expected/1 actual/1))
+
+           ...          _
+           ...          false)
+           ...        (when (/.literal (expected/0 expected/1))
+           ...          {.#Apply actual/1 actual/0}
+           ...          (and (same? expected/0 actual/0)
+           ...               (same? expected/1 actual/1))
+
+           ...          _
+           ...          false)))
 
            ..\\parser
 
diff --git a/stdlib/source/test/lux/meta/type/check.lux b/stdlib/source/test/lux/meta/type/check.lux
index 7bf4c6647..33469b0b0 100644
--- a/stdlib/source/test/lux/meta/type/check.lux
+++ b/stdlib/source/test/lux/meta/type/check.lux
@@ -582,28 +582,28 @@
 (def (handles_quantification! nominal)
   (-> Type Bit)
   (let [universals_satisfy_themselves!
-        (..succeeds? (/.check (.type_literal (All (_ a) (Maybe a)))
-                              (.type_literal (All (_ a) (Maybe a)))))
+        (..succeeds? (/.check (//.literal (All (_ a) (Maybe a)))
+                              (//.literal (All (_ a) (Maybe a)))))
 
         existentials_satisfy_themselves!
-        (..succeeds? (/.check (.type_literal (Ex (_ a) (Maybe a)))
-                              (.type_literal (Ex (_ a) (Maybe a)))))
+        (..succeeds? (/.check (//.literal (Ex (_ a) (Maybe a)))
+                              (//.literal (Ex (_ a) (Maybe a)))))
 
         universals_satisfy_particulars!
-        (..succeeds? (/.check (.type_literal (Maybe nominal))
-                              (.type_literal (All (_ a) (Maybe a)))))
+        (..succeeds? (/.check (//.literal (Maybe nominal))
+                              (//.literal (All (_ a) (Maybe a)))))
 
         particulars_do_not_satisfy_universals!
-        (..fails? (/.check (.type_literal (All (_ a) (Maybe a)))
-                           (.type_literal (Maybe nominal))))
+        (..fails? (/.check (//.literal (All (_ a) (Maybe a)))
+                           (//.literal (Maybe nominal))))
 
         particulars_satisfy_existentials!
-        (..succeeds? (/.check (.type_literal (Ex (_ a) (Maybe a)))
-                              (.type_literal (Maybe nominal))))
+        (..succeeds? (/.check (//.literal (Ex (_ a) (Maybe a)))
+                              (//.literal (Maybe nominal))))
 
         existentials_do_not_satisfy_particulars!
-        (..fails? (/.check (.type_literal (Maybe nominal))
-                           (.type_literal (Ex (_ a) (Maybe a)))))]
+        (..fails? (/.check (//.literal (Maybe nominal))
+                           (//.literal (Ex (_ a) (Maybe a)))))]
     (and universals_satisfy_themselves!
          existentials_satisfy_themselves!
 
@@ -641,26 +641,26 @@
 (def (handles_application! nominal/0 nominal/1)
   (-> Type Type Bit)
   (let [types_flow_through!
-        (and (..succeeds? (/.check (.type_literal ((All (_ a) a) nominal/0))
+        (and (..succeeds? (/.check (//.literal ((All (_ a) a) nominal/0))
                                    nominal/0))
              (..succeeds? (/.check nominal/0
-                                   (.type_literal ((All (_ a) a) nominal/0))))
+                                   (//.literal ((All (_ a) a) nominal/0))))
 
-             (..succeeds? (/.check (.type_literal ((Ex (_ a) a) nominal/0))
+             (..succeeds? (/.check (//.literal ((Ex (_ a) a) nominal/0))
                                    nominal/0))
              (..succeeds? (/.check nominal/0
-                                   (.type_literal ((Ex (_ a) a) nominal/0)))))
+                                   (//.literal ((Ex (_ a) a) nominal/0)))))
 
         multiple_parameters!
-        (and (..succeeds? (/.check (.type_literal ((All (_ a b) [a b]) nominal/0 nominal/1))
-                                   (.type_literal [nominal/0 nominal/1])))
-             (..succeeds? (/.check (.type_literal [nominal/0 nominal/1])
-                                   (.type_literal ((All (_ a b) [a b]) nominal/0 nominal/1))))
+        (and (..succeeds? (/.check (//.literal ((All (_ a b) [a b]) nominal/0 nominal/1))
+                                   (//.literal [nominal/0 nominal/1])))
+             (..succeeds? (/.check (//.literal [nominal/0 nominal/1])
+                                   (//.literal ((All (_ a b) [a b]) nominal/0 nominal/1))))
              
-             (..succeeds? (/.check (.type_literal ((Ex (_ a b) [a b]) nominal/0 nominal/1))
-                                   (.type_literal [nominal/0 nominal/1])))
-             (..succeeds? (/.check (.type_literal [nominal/0 nominal/1])
-                                   (.type_literal ((Ex (_ a b) [a b]) nominal/0 nominal/1)))))]
+             (..succeeds? (/.check (//.literal ((Ex (_ a b) [a b]) nominal/0 nominal/1))
+                                   (//.literal [nominal/0 nominal/1])))
+             (..succeeds? (/.check (//.literal [nominal/0 nominal/1])
+                                   (//.literal ((Ex (_ a b) [a b]) nominal/0 nominal/1)))))]
     (and types_flow_through!
          multiple_parameters!)))
 
@@ -843,10 +843,10 @@
   (Random Bit)
   (do random.monad
     [example ..clean_type]
-    (in (and (and (/.subsumes? (.type_literal (List example)) (.type_literal (All (_ a) (List a))))
-                  (not (/.subsumes? (.type_literal (All (_ a) (List a))) (.type_literal (List example)))))
-             (and (/.subsumes? (.type_literal (Ex (_ a) (List a))) (.type_literal (List example)))
-                  (not (/.subsumes? (.type_literal (List example)) (.type_literal (Ex (_ a) (List a))))))))))
+    (in (and (and (/.subsumes? (//.literal (List example)) (//.literal (All (_ a) (List a))))
+                  (not (/.subsumes? (//.literal (All (_ a) (List a))) (//.literal (List example)))))
+             (and (/.subsumes? (//.literal (Ex (_ a) (List a))) (//.literal (List example)))
+                  (not (/.subsumes? (//.literal (List example)) (//.literal (Ex (_ a) (List a))))))))))
 
 (def for_subsumption|named
   (Random Bit)
diff --git a/stdlib/source/test/lux/meta/type/variance.lux b/stdlib/source/test/lux/meta/type/variance.lux
index 0c6c106f9..b84e6b122 100644
--- a/stdlib/source/test/lux/meta/type/variance.lux
+++ b/stdlib/source/test/lux/meta/type/variance.lux
@@ -28,16 +28,16 @@
         [expected random.nat])
       (all _.and
            (_.coverage [/.Co]
-             (and (//check.subsumes? (type_literal (/.Co Super)) (type_literal (/.Co Sub)))
-                  (not (//check.subsumes? (type_literal (/.Co Sub)) (type_literal (/.Co Super))))))
+             (and (//check.subsumes? (//.literal (/.Co Super)) (//.literal (/.Co Sub)))
+                  (not (//check.subsumes? (//.literal (/.Co Sub)) (//.literal (/.Co Super))))))
            (_.coverage [/.Contra]
-             (and (//check.subsumes? (type_literal (/.Contra Sub)) (type_literal (/.Contra Super)))
-                  (not (//check.subsumes? (type_literal (/.Contra Super)) (type_literal (/.Contra Sub))))))
+             (and (//check.subsumes? (//.literal (/.Contra Sub)) (//.literal (/.Contra Super)))
+                  (not (//check.subsumes? (//.literal (/.Contra Super)) (//.literal (/.Contra Sub))))))
            (_.coverage [/.In]
-             (and (//check.subsumes? (type_literal (/.In Super)) (type_literal (/.In Super)))
-                  (//check.subsumes? (type_literal (/.In Sub)) (type_literal (/.In Sub)))
-                  (not (//check.subsumes? (type_literal (/.In Sub)) (type_literal (/.In Super))))
-                  (not (//check.subsumes? (type_literal (/.In Super)) (type_literal (/.In Sub))))))
+             (and (//check.subsumes? (//.literal (/.In Super)) (//.literal (/.In Super)))
+                  (//check.subsumes? (//.literal (/.In Sub)) (//.literal (/.In Sub)))
+                  (not (//check.subsumes? (//.literal (/.In Sub)) (//.literal (/.In Super))))
+                  (not (//check.subsumes? (//.literal (/.In Super)) (//.literal (/.In Sub))))))
            (_.for [/.Mutable]
                   (all _.and
                        (_.coverage [/.write /.read]
diff --git a/stdlib/source/test/lux/world.lux b/stdlib/source/test/lux/world.lux
index fe8136b3c..6fd831f0c 100644
--- a/stdlib/source/test/lux/world.lux
+++ b/stdlib/source/test/lux/world.lux
@@ -22,7 +22,9 @@
     ["[1]/[0]" session]]
    ["[1]/[0]" market
     ["[1]/[0]" price]
-    ["[1]/[0]" analysis]]]
+    ["[1]/[0]" analysis]]
+   ["[1]/[0]" interest
+    ["[1]/[0]" rate]]]
   ["[1][0]" net]
   ["[1][0]" time]
   ["[1][0]" locale]
@@ -43,6 +45,7 @@
        /finance/trade/session.test
        /finance/market/price.test
        /finance/market/analysis.test
+       /finance/interest/rate.test
 
        /net.test
        /time.test
diff --git a/stdlib/source/test/lux/world/file/extension.lux b/stdlib/source/test/lux/world/file/extension.lux
index 5fe5207a6..4c3a957ce 100644
--- a/stdlib/source/test/lux/world/file/extension.lux
+++ b/stdlib/source/test/lux/world/file/extension.lux
@@ -23,82 +23,110 @@
  [\\library
   ["[0]" /]])
 
-(with_expansions [<extensions> (these [/.compressed_7z_archive]
-
-                                      [/.archive]
-                                      [/.advanced_audio_coding]
-                                      [/.agda_source_code]
-                                      [/.android_application_package]
-                                      [/.assembler_source_code]
-
-                                      [/.binary]
-                                      [/.bzip2_archive]
-                                      [/.blender_project]
-
-                                      [/.c_source_code]
-                                      [/.c++_source_code]
-                                      [/.java_class]
-                                      [/.dos_program]
-                                      [/.c#_source_code]
-                                      [/.css]
-                                      [/.comma_separated_values]
-
-                                      [/.d_source_code]
-                                      [/.dart_source_code]
-
-                                      [/.emacs_lisp_source_code]
-                                      [/.compiled_emacs_lisp_code]
-                                      [/.executable_and_linkable_file]
-                                      [/.electronic_publication]
-                                      [/.erlang_source_code]
-                                      [/.executable_program]
-
-                                      [/.apophysis_fractal]
-
-                                      [/.gps_exchange_format]
-                                      [/.gzip_compressed_data]
-
-                                      [/.http_archive_format]
-                                      [/.c_header]
-                                      [/.html]
-
-                                      [/.optical_disc_file_system]
-
-                                      [/.java_archive]
-                                      [/.java_source_code]
-                                      [/.javascript_source_code]
-                                      [/.javascript_object_notation]
-
-                                      [/.llvm_assembly]
-                                      [/.lua_source_code]
-                                      [/.lzip_archive]
-
-                                      [/.markdown]
-                                      [/.musical_instrument_digital_interface]
-
-                                      [/.object_code]
-                                      [/.vorbis_audio]
-
-                                      [/.portable_document_format]
-                                      [/.php_source_code]
-                                      [/.maven_build_configuration]
-                                      [/.postscript_source_code]
-                                      [/.python_source_code]
-
-                                      [/.ruby_source_code]
-
-                                      [/.scheme_source_code]
-                                      [/.unix_shell_script]
-                                      [/.structured_query_language]
-                                      [/.scalable_vector_graphics]
-                                      
-                                      [/.tape_archive]
-                                      [/.temporary_file]
-                                      [/.tab_separated_values]
-
-                                      [/.yaml]
-
-                                      [/.zip_archive])]
+(with_expansions [<options> (these [%->d
+                                    [/.compressed_7z_archive
+
+                                     /.archive
+                                     /.advanced_audio_coding
+                                     /.agda_source_code
+                                     /.android_application_package
+                                     /.assembler_source_code
+
+                                     /.binary
+                                     /.bzip2_archive
+                                     /.blender_project
+
+                                     /.c_source_code
+                                     /.c++_source_code
+                                     /.java_class
+                                     /.dos_program
+                                     /.c#_source_code
+                                     /.css
+                                     /.comma_separated_values
+
+                                     /.d_source_code
+                                     /.dart_source_code]]
+
+                                   [e->j
+                                    [/.emacs_lisp_source_code
+                                     /.compiled_emacs_lisp_code
+                                     /.executable_and_linkable_file
+                                     /.electronic_publication
+                                     /.erlang_source_code
+                                     /.executable_program
+
+                                     /.apophysis_fractal
+
+                                     /.gps_exchange_format
+                                     /.gzip_compressed_data
+
+                                     /.http_archive_format
+                                     /.c_header
+                                     /.html
+
+                                     /.optical_disc_file_system
+
+                                     /.java_archive
+                                     /.java_source_code
+                                     /.javascript_source_code
+                                     /.javascript_object_notation]]
+
+                                   [l->p
+                                    [/.llvm_assembly
+                                     /.lua_source_code
+                                     /.lzip_archive
+
+                                     /.markdown
+                                     /.musical_instrument_digital_interface
+
+                                     /.object_code
+                                     /.vorbis_audio
+
+                                     /.portable_document_format
+                                     /.php_source_code
+                                     /.maven_build_configuration
+                                     /.postscript_source_code
+                                     /.python_source_code]]
+
+                                   [r->z
+                                    [/.ruby_source_code
+
+                                     /.scheme_source_code
+                                     /.unix_shell_script
+                                     /.structured_query_language
+                                     /.scalable_vector_graphics
+                                     
+                                     /.tape_archive
+                                     /.temporary_file
+                                     /.tab_separated_values
+
+                                     /.yaml
+
+                                     /.zip_archive]])]
+  (def all_options
+    (list.together (`` (list (,, (with_template [<definition> <by_letter_range>]
+                                   [((is (-> Any (List /.Extension))
+                                         (function (_ _)
+                                           (`` (list (,, (template.spliced <by_letter_range>))))))
+                                     123)]
+                                   
+                                   <options>))))))
+
+  (def unique_options
+    (set.of_list text.hash ..all_options))
+  
+  (def verdict
+    (n.= (list.size ..all_options)
+         (set.size ..unique_options)))
+
+  (with_template [<definition> <by_letter_range>]
+    [(def <definition>
+       Test
+       (_.coverage <by_letter_range>
+         ..verdict))]
+    
+    <options>)
+  
   (def .public test
     Test
     (<| (_.covering /._)
@@ -106,14 +134,10 @@
           [])
         (_.for [/.Extension])
         (`` (all _.and
-                 (_.coverage [(,, (with_template [<extension>]
-                                    [<extension>]
-                                    
-                                    <extensions>))]
-                   (let [options (list <extensions>)
-                         uniques (set.of_list text.hash options)]
-                     (n.= (list.size options)
-                          (set.size uniques))))
+                 (,, (with_template [<definition> <by_letter_range>]
+                       [<definition>]
+                       
+                       <options>))
                  (,, (with_template [<original> <aliases>]
                        [(with_expansions [<aliases>' (template.spliced <aliases>)]
                           (`` (_.coverage [(,, (with_template [<extension>]
diff --git a/stdlib/source/test/lux/world/finance/interest/rate.lux b/stdlib/source/test/lux/world/finance/interest/rate.lux
new file mode 100644
index 000000000..8ee6dac21
--- /dev/null
+++ b/stdlib/source/test/lux/world/finance/interest/rate.lux
@@ -0,0 +1,64 @@
+... This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+... If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+(.require
+ [library
+  [lux (.except)
+   [abstract
+    [monad (.only do)]
+    ["[0]" monoid
+     ["[1]T" \\test]]]
+   [data
+    ["[0]" bit (.use "[1]#[0]" equivalence)]
+    ["[0]" text (.use "[1]#[0]" equivalence)]]
+   [math
+    ["[0]" random (.only Random) (.use "[1]#[0]" functor)]
+    [number
+     ["n" nat]
+     ["f" frac]]]
+   [test
+    ["_" property (.only Test)]]]]
+ [\\library
+  ["[0]" / (.only)
+   [///
+    ["[0]" money (.only)
+     ["[0]" currency]]]]])
+
+(def .public random
+  (Random /.Rate)
+  (random#each f.abs random.safe_frac))
+
+(def .public test
+  Test
+  (<| (_.covering /._)
+      (do [! random.monad]
+        [left ..random
+         right ..random
+
+         money (of ! each (|>> (n.% 1,000) ++) random.nat)])
+      (_.for [/.Rate])
+      (all _.and
+           (_.for [/.monoid /.break_even /.compound]
+                  (monoidT.spec f.equivalence /.monoid ..random))
+           
+           (_.coverage [/.format]
+             (bit#= (f.= left right)
+                    (text#= (/.format left) (/.format right))))
+           (_.coverage [/.loss? /.gain? /.break_even?]
+             (or (and (/.loss? left)
+                      (not (/.gain? left))
+                      (not (/.break_even? left)))
+                 (and (not (/.loss? left))
+                      (/.gain? left)
+                      (not (/.break_even? left)))
+                 (and (not (/.loss? left))
+                      (not (/.gain? left))
+                      (/.break_even? left))))
+           (_.coverage [/.rate]
+             (and (/.loss? (/.rate (money.money currency.usd money)
+                                   (money.money currency.usd (-- money))))
+                  (/.gain? (/.rate (money.money currency.usd money)
+                                   (money.money currency.usd (++ money))))
+                  (/.break_even? (/.rate (money.money currency.usd money)
+                                         (money.money currency.usd money)))))
+           )))