- Re-named "struct:" to "structure:".

68 files changed, 202 insertions, 202 deletions

diff --git a/stdlib/source/lux.lux b/stdlib/source/lux.lux
index bbf765e9a..238d77bd8 100644
--- a/stdlib/source/lux.lux
+++ b/stdlib/source/lux.lux
@@ -3844,7 +3844,7 @@
         (#Left "Not expecting any type.")))))
 
 (macro: #export (struct tokens)
-  {#.doc "Not meant to be used directly. Prefer \"struct:\"."}
+  {#.doc "Not meant to be used directly. Prefer \"structure:\"."}
   (do Monad<Meta>
     [tokens' (monad/map Monad<Meta> macro-expand tokens)
      struct-type get-expected-type
@@ -3880,9 +3880,9 @@
   (-> (List Text) Text)
   (|> parts list/reverse (list/fold text/compose "")))
 
-(macro: #export (struct: tokens)
+(macro: #export (structure: tokens)
   {#.doc "## Definition of structures ala ML.
-          (struct: #export Ord<Int> (Ord Int)
+          (structure: #export Ord<Int> (Ord Int)
             (def: eq Equivalence<Int>)
             (def: (< test subject)
               (lux.< test subject))
@@ -3956,7 +3956,7 @@
         (fail "Cannot infer name, so struct must have a name other than \"_\"!"))
 
       #None
-      (fail "Wrong syntax for struct:"))))
+      (fail "Wrong syntax for structure:"))))
 
 (def: #export (id x)
   {#.doc "Identity function.
diff --git a/stdlib/source/lux/concurrency/frp.lux b/stdlib/source/lux/concurrency/frp.lux
index 7b4bfbec0..dda469f62 100644
--- a/stdlib/source/lux/concurrency/frp.lux
+++ b/stdlib/source/lux/concurrency/frp.lux
@@ -96,14 +96,14 @@
       output)))
 
 ## [Structures]
-(struct: #export _ (Functor Channel)
+(structure: #export _ (Functor Channel)
   (def: (map f input)
     (let [output (channel [])]
       (exec (io.run (listen (|>> f (publish output))
                             input))
         output))))
 
-(struct: #export _ (Apply Channel)
+(structure: #export _ (Apply Channel)
   (def: functor Functor<Channel>)
 
   (def: (apply ff fa)
@@ -114,7 +114,7 @@
                             ff))
         output))))
 
-(struct: #export _ (Monad Channel)
+(structure: #export _ (Monad Channel)
   (def: functor Functor<Channel>)
 
   (def: (wrap a)
diff --git a/stdlib/source/lux/concurrency/promise.lux b/stdlib/source/lux/concurrency/promise.lux
index 866cdd8da..b2597c2cc 100644
--- a/stdlib/source/lux/concurrency/promise.lux
+++ b/stdlib/source/lux/concurrency/promise.lux
@@ -72,14 +72,14 @@
     (#.Some _)
     true))
 
-(struct: #export _ (Functor Promise)
+(structure: #export _ (Functor Promise)
   (def: (map f fa)
     (let [fb (promise #.None)]
       (exec (await (function (_ a) (resolve (f a) fb))
                    fa)
         fb))))
 
-(struct: #export _ (Apply Promise)
+(structure: #export _ (Apply Promise)
   (def: functor Functor<Promise>)
 
   (def: (apply ff fa)
@@ -90,7 +90,7 @@
                    ff)
         fb))))
 
-(struct: #export _ (Monad Promise)
+(structure: #export _ (Monad Promise)
   (def: functor Functor<Promise>)
 
   (def: (wrap a)
diff --git a/stdlib/source/lux/concurrency/stm.lux b/stdlib/source/lux/concurrency/stm.lux
index 9fef9f59e..eddaabf2b 100644
--- a/stdlib/source/lux/concurrency/stm.lux
+++ b/stdlib/source/lux/concurrency/stm.lux
@@ -127,13 +127,13 @@
       [(#.Cons [var (read!! var) value] tx)
        []])))
 
-(struct: #export _ (Functor STM)
+(structure: #export _ (Functor STM)
   (def: (map f fa)
     (function (_ tx)
       (let [[tx' a] (fa tx)]
         [tx' (f a)]))))
 
-(struct: #export _ (Apply STM)
+(structure: #export _ (Apply STM)
   (def: functor Functor<STM>)
 
   (def: (apply ff fa)
@@ -142,7 +142,7 @@
             [tx'' a] (fa tx')]
         [tx'' (f a)]))))
 
-(struct: #export _ (Monad STM)
+(structure: #export _ (Monad STM)
   (def: functor Functor<STM>)
 
   (def: (wrap a)
diff --git a/stdlib/source/lux/concurrency/task.lux b/stdlib/source/lux/concurrency/task.lux
index 911fdd2d2..d51574bbc 100644
--- a/stdlib/source/lux/concurrency/task.lux
+++ b/stdlib/source/lux/concurrency/task.lux
@@ -30,7 +30,7 @@
   (All [a] (-> (Task a) (Task (E.Error a))))
   (:: P.Functor<Promise> map (|>> #E.Success) computation))
 
-(struct: #export _ (F.Functor Task)
+(structure: #export _ (F.Functor Task)
   (def: (map f fa)
     (:: P.Functor<Promise> map
         (function (_ fa')
@@ -42,7 +42,7 @@
             (#E.Success (f a))))
         fa)))
 
-(struct: #export _ (A.Apply Task)
+(structure: #export _ (A.Apply Task)
   (def: functor Functor<Task>)
 
   (def: (apply ff fa)
@@ -54,7 +54,7 @@
                a fa']
               (wrap (f a)))))))
 
-(struct: #export _ (Monad Task)
+(structure: #export _ (Monad Task)
   (def: functor Functor<Task>)
 
   (def: wrap return)
diff --git a/stdlib/source/lux/control/apply.lux b/stdlib/source/lux/control/apply.lux
index 4c3d73ba1..2dd932140 100644
--- a/stdlib/source/lux/control/apply.lux
+++ b/stdlib/source/lux/control/apply.lux
@@ -11,7 +11,7 @@
        (-> (f (-> a b)) (f a) (f b)))
      apply))
 
-(struct: #export (compose Monad<F> Apply<F> Apply<G>)
+(structure: #export (compose Monad<F> Apply<F> Apply<G>)
   {#.doc "Applicative functor composition."}
   (All [F G]
     (-> (Monad F) (Apply F) (Apply G)
diff --git a/stdlib/source/lux/control/codec.lux b/stdlib/source/lux/control/codec.lux
index 1c0375831..b219c8522 100644
--- a/stdlib/source/lux/control/codec.lux
+++ b/stdlib/source/lux/control/codec.lux
@@ -12,7 +12,7 @@
      decode))
 
 ## [Values]
-(struct: #export (compose Codec<c,b> Codec<b,a>)
+(structure: #export (compose Codec<c,b> Codec<b,a>)
   {#.doc "Codec composition."}
   (All [a b c]
     (-> (Codec c b) (Codec b a)
diff --git a/stdlib/source/lux/control/continuation.lux b/stdlib/source/lux/control/continuation.lux
index d23ebec18..0cb7b5c7e 100644
--- a/stdlib/source/lux/control/continuation.lux
+++ b/stdlib/source/lux/control/continuation.lux
@@ -22,11 +22,11 @@
   (All [a] (-> (Cont a a) a))
   (cont id))
 
-(struct: #export Functor<Cont> (All [o] (Functor (All [i] (Cont i o))))
+(structure: #export Functor<Cont> (All [o] (Functor (All [i] (Cont i o))))
   (def: (map f fv)
     (function (_ k) (fv (compose k f)))))
 
-(struct: #export Apply<Cont> (All [o] (Apply (All [i] (Cont i o))))
+(structure: #export Apply<Cont> (All [o] (Apply (All [i] (Cont i o))))
   (def: functor Functor<Cont>)
 
   (def: (apply ff fv)
@@ -35,7 +35,7 @@
           (function (_ v)) fv
           (function (_ f)) ff))))
 
-(struct: #export Monad<Cont> (All [o] (Monad (All [i] (Cont i o))))
+(structure: #export Monad<Cont> (All [o] (Monad (All [i] (Cont i o))))
   (def: functor Functor<Cont>)
 
   (def: (wrap value)
diff --git a/stdlib/source/lux/control/functor.lux b/stdlib/source/lux/control/functor.lux
index c4478a710..8fcb40c55 100644
--- a/stdlib/source/lux/control/functor.lux
+++ b/stdlib/source/lux/control/functor.lux
@@ -18,7 +18,7 @@
 (type: #export (<$> f g)
   (All [a] (f (g a))))
 
-(struct: #export (compose Functor<F> Functor<G>)
+(structure: #export (compose Functor<F> Functor<G>)
   {#.doc "Functor composition."}
   (All [F G] (-> (Functor F) (Functor G) (Functor (All [a] (F (G a))))))
   (def: (map f fga)
diff --git a/stdlib/source/lux/control/interval.lux b/stdlib/source/lux/control/interval.lux
index a53115576..1cc825070 100644
--- a/stdlib/source/lux/control/interval.lux
+++ b/stdlib/source/lux/control/interval.lux
@@ -133,7 +133,7 @@
   [after?  >]
   )
 
-(struct: #export Equivalence<Interval> (All [a] (Equivalence (Interval a)))
+(structure: #export Equivalence<Interval> (All [a] (Equivalence (Interval a)))
   (def: (= reference sample)
     (let [(^open) reference]
       (and (= bottom (:: sample bottom))
diff --git a/stdlib/source/lux/control/monad/free.lux b/stdlib/source/lux/control/monad/free.lux
index 716ae805b..400c5fc31 100644
--- a/stdlib/source/lux/control/monad/free.lux
+++ b/stdlib/source/lux/control/monad/free.lux
@@ -9,7 +9,7 @@
   (#Pure a)
   (#Effect (F (Free F a))))
 
-(struct: #export (Functor<Free> dsl)
+(structure: #export (Functor<Free> dsl)
   (All [F] (-> (Functor F) (Functor (Free F))))
   
   (def: (map f ea)
@@ -20,7 +20,7 @@
       (#Effect value)
       (#Effect (:: dsl map (map f) value)))))
 
-(struct: #export (Apply<Free> dsl)
+(structure: #export (Apply<Free> dsl)
   (All [F] (-> (Functor F) (Apply (Free F))))
   
   (def: functor (Functor<Free> dsl))
@@ -41,7 +41,7 @@
                    ff))
       )))
 
-(struct: #export (Monad<Free> dsl)
+(structure: #export (Monad<Free> dsl)
   (All [F] (-> (Functor F) (Monad (Free F))))
 
   (def: functor (Functor<Free> dsl))
diff --git a/stdlib/source/lux/control/parser.lux b/stdlib/source/lux/control/parser.lux
index 91c3a84a8..1ad76a50a 100644
--- a/stdlib/source/lux/control/parser.lux
+++ b/stdlib/source/lux/control/parser.lux
@@ -13,7 +13,7 @@
   (-> s (e.Error [s a])))
 
 ## [Structures]
-(struct: #export Functor<Parser> (All [s] (Functor (Parser s)))
+(structure: #export Functor<Parser> (All [s] (Functor (Parser s)))
   (def: (map f ma)
     (function (_ input)
       (case (ma input)
@@ -23,7 +23,7 @@
         (#e.Success [input' a])
         (#e.Success [input' (f a)])))))
 
-(struct: #export Apply<Parser> (All [s] (Apply (Parser s)))
+(structure: #export Apply<Parser> (All [s] (Apply (Parser s)))
   (def: functor Functor<Parser>)
 
   (def: (apply ff fa)
@@ -40,7 +40,7 @@
         (#e.Error msg)
         (#e.Error msg)))))
 
-(struct: #export Monad<Parser> (All [s] (Monad (Parser s)))
+(structure: #export Monad<Parser> (All [s] (Monad (Parser s)))
   (def: functor Functor<Parser>)
 
   (def: (wrap x)
diff --git a/stdlib/source/lux/control/predicate.lux b/stdlib/source/lux/control/predicate.lux
index 44e273dee..56c048593 100644
--- a/stdlib/source/lux/control/predicate.lux
+++ b/stdlib/source/lux/control/predicate.lux
@@ -23,7 +23,7 @@
   )
 
 (do-template [<name> <identity> <composition>]
-  [(struct: #export <name> (All [a] (Monoid (Predicate a)))
+  [(structure: #export <name> (All [a] (Monoid (Predicate a)))
      (def: identity <identity>)
      (def: compose <composition>))]
 
diff --git a/stdlib/source/lux/control/reader.lux b/stdlib/source/lux/control/reader.lux
index 228e474db..274c5b1cc 100644
--- a/stdlib/source/lux/control/reader.lux
+++ b/stdlib/source/lux/control/reader.lux
@@ -10,14 +10,14 @@
   (-> r a))
 
 ## [Structures]
-(struct: #export Functor<Reader>
+(structure: #export Functor<Reader>
   (All [r] (F.Functor (Reader r)))
   
   (def: (map f fa)
     (function (_ env)
       (f (fa env)))))
 
-(struct: #export Apply<Reader>
+(structure: #export Apply<Reader>
   (All [r] (A.Apply (Reader r)))
   
   (def: functor Functor<Reader>)
@@ -26,7 +26,7 @@
     (function (_ env)
       ((ff env) (fa env)))))
 
-(struct: #export Monad<Reader>
+(structure: #export Monad<Reader>
   (All [r] (Monad (Reader r)))
   
   (def: functor Functor<Reader>)
@@ -53,7 +53,7 @@
   (All [r a] (-> r (Reader r a) a))
   (proc env))
 
-(struct: #export (ReaderT Monad<M>)
+(structure: #export (ReaderT Monad<M>)
   {#.doc "Monad transformer for Reader."}
   (All [M] (-> (Monad M) (All [e] (Monad (All [a] (Reader e (M a)))))))
 
diff --git a/stdlib/source/lux/control/region.lux b/stdlib/source/lux/control/region.lux
index 7397d9781..d35495d93 100644
--- a/stdlib/source/lux/control/region.lux
+++ b/stdlib/source/lux/control/region.lux
@@ -62,7 +62,7 @@
                                cleaners)
                        (#e.Success value)])))
 
-(struct: #export (Functor<Region> Functor<m>)
+(structure: #export (Functor<Region> Functor<m>)
   (All [m]
     (-> (Functor m)
         (All [r] (Functor (Region r m)))))
@@ -80,7 +80,7 @@
                            (#e.Error error))])
             (fa region+cleaners))))))
 
-(struct: #export (Apply<Region> Monad<m>)
+(structure: #export (Apply<Region> Monad<m>)
   (All [m]
     (-> (Monad m)
         (All [r] (Apply (Region r m)))))
@@ -101,7 +101,7 @@
                [_ (#e.Error error)])
           (wrap [cleaners (#e.Error error)]))))))
 
-(struct: #export (Monad<Region> Monad<m>)
+(structure: #export (Monad<Region> Monad<m>)
   (All [m]
     (-> (Monad m)
         (All [r] (Monad (Region r m)))))
diff --git a/stdlib/source/lux/control/state.lux b/stdlib/source/lux/control/state.lux
index be8844a0c..244052f2d 100644
--- a/stdlib/source/lux/control/state.lux
+++ b/stdlib/source/lux/control/state.lux
@@ -10,7 +10,7 @@
   (-> s [s a]))
 
 ## [Structures]
-(struct: #export Functor<State>
+(structure: #export Functor<State>
   (All [s] (F.Functor (State s)))
   
   (def: (map f ma)
@@ -18,7 +18,7 @@
       (let [[state' a] (ma state)]
         [state' (f a)]))))
 
-(struct: #export Apply<State>
+(structure: #export Apply<State>
   (All [s] (A.Apply (State s)))
   
   (def: functor Functor<State>)
@@ -29,7 +29,7 @@
             [state'' a] (fa state')]
         [state'' (f a)]))))
 
-(struct: #export Monad<State>
+(structure: #export Monad<State>
   (All [s] (Monad (State s)))
   
   (def: functor Functor<State>)
@@ -80,7 +80,7 @@
   (All [s a] (-> s (State s a) [s a]))
   (action state))
 
-(struct: (Functor<State'> Functor<M>)
+(structure: (Functor<State'> Functor<M>)
   (All [M s] (-> (F.Functor M) (F.Functor (All [a] (-> s (M [s a]))))))
   
   (def: (map f sfa)
@@ -88,7 +88,7 @@
       (:: Functor<M> map (function (_ [s a]) [s (f a)])
           (sfa state)))))
 
-(struct: (Apply<State'> Monad<M>)
+(structure: (Apply<State'> Monad<M>)
   (All [M s] (-> (Monad M) (A.Apply (All [a] (-> s (M [s a]))))))
   
   (def: functor (Functor<State'> (:: Monad<M> functor)))
@@ -109,7 +109,7 @@
   (All [M s a] (-> s (State' M s a) (M [s a])))
   (action state))
 
-(struct: #export (Monad<State'> Monad<M>)
+(structure: #export (Monad<State'> Monad<M>)
   {#.doc "A monad transformer to create composite stateful computations."}
   (All [M s] (-> (Monad M) (Monad (State' M s))))
 
diff --git a/stdlib/source/lux/control/thread.lux b/stdlib/source/lux/control/thread.lux
index 5709b41bb..b54de05ef 100644
--- a/stdlib/source/lux/control/thread.lux
+++ b/stdlib/source/lux/control/thread.lux
@@ -33,7 +33,7 @@
         a))
   (thread []))
 
-(struct: #export Functor<Thread>
+(structure: #export Functor<Thread>
   (All [!] (Functor (Thread !)))
 
   (def: (map f)
@@ -41,7 +41,7 @@
       (function (_ !)
         (f (fa !))))))
 
-(struct: #export Apply<Thread>
+(structure: #export Apply<Thread>
   (All [!] (Apply (Thread !)))
 
   (def: functor Functor<Thread>)
@@ -50,7 +50,7 @@
     (function (_ !)
       ((ff !) (fa !)))))
 
-(struct: #export Monad<Thread>
+(structure: #export Monad<Thread>
   (All [!] (Monad (Thread !)))
 
   (def: functor Functor<Thread>)
diff --git a/stdlib/source/lux/control/writer.lux b/stdlib/source/lux/control/writer.lux
index 3dcf64cc3..33b0df8a9 100644
--- a/stdlib/source/lux/control/writer.lux
+++ b/stdlib/source/lux/control/writer.lux
@@ -10,7 +10,7 @@
   {#log l
    #value a})
 
-(struct: #export Functor<Writer>
+(structure: #export Functor<Writer>
   (All [l]
     (F.Functor (Writer l)))
   
@@ -18,7 +18,7 @@
     (let [[log datum] fa]
       [log (f datum)])))
 
-(struct: #export (Apply<Writer> mon)
+(structure: #export (Apply<Writer> mon)
   (All [l]
     (-> (Monoid l) (A.Apply (Writer l))))
   
@@ -29,7 +29,7 @@
           [log2 a] fa]
       [(:: mon compose log1 log2) (f a)])))
 
-(struct: #export (Monad<Writer> mon)
+(structure: #export (Monad<Writer> mon)
   (All [l]
     (-> (Monoid l) (Monad (Writer l))))
   
@@ -47,7 +47,7 @@
   (All [l] (-> l (Writer l Any)))
   [l []])
 
-(struct: #export (WriterT Monoid<l> Monad<M>)
+(structure: #export (WriterT Monoid<l> Monad<M>)
   (All [l M] (-> (Monoid l) (Monad M) (Monad (All [a] (M (Writer l a))))))
 
   (def: functor (F.compose (get@ #monad.functor Monad<M>) Functor<Writer>))
diff --git a/stdlib/source/lux/data/bool.lux b/stdlib/source/lux/data/bool.lux
index 88c1011e5..eee9de319 100644
--- a/stdlib/source/lux/data/bool.lux
+++ b/stdlib/source/lux/data/bool.lux
@@ -7,13 +7,13 @@
        function))
 
 ## [Structures]
-(struct: #export _ (Equivalence Bool)
+(structure: #export _ (Equivalence Bool)
   (def: (= x y)
     (if x
       y
       (not y))))
 
-(struct: #export _ (Hash Bool)
+(structure: #export _ (Hash Bool)
   (def: eq Equivalence<Bool>)
   (def: (hash value)
     (case value
@@ -21,7 +21,7 @@
       false +0)))
 
 (do-template [<name> <identity> <op>]
-  [(struct: #export <name> (Monoid Bool)
+  [(structure: #export <name> (Monoid Bool)
      (def: identity <identity>)
      (def: (compose x y)
        (<op> x y)))]
@@ -30,7 +30,7 @@
   [And@Monoid<Bool> true and]
   )
 
-(struct: #export _ (Codec Text Bool)
+(structure: #export _ (Codec Text Bool)
   (def: (encode x)
     (if x
       "true"
diff --git a/stdlib/source/lux/data/coll/array.lux b/stdlib/source/lux/data/coll/array.lux
index 8f3bee0c3..842acec39 100644
--- a/stdlib/source/lux/data/coll/array.lux
+++ b/stdlib/source/lux/data/coll/array.lux
@@ -149,7 +149,7 @@
                #.None
                output)))))
 
-(struct: #export (Equivalence<Array> Equivalence<a>)
+(structure: #export (Equivalence<Array> Equivalence<a>)
   (All [a] (-> (Equivalence a) (Equivalence (Array a))))
   (def: (= xs ys)
     (let [sxs (size xs)
@@ -170,7 +170,7 @@
                       (list.n/range +0 (dec sxs)))))
     ))
 
-(struct: #export Monoid<Array> (All [a] (Monoid (Array a)))
+(structure: #export Monoid<Array> (All [a] (Monoid (Array a)))
   (def: identity (new +0))
 
   (def: (compose xs ys)
@@ -180,7 +180,7 @@
           (copy sxs +0 xs +0)
           (copy sxy +0 ys sxs)))))
 
-(struct: #export _ (Functor Array)
+(structure: #export _ (Functor Array)
   (def: (map f ma)
     (let [arr-size (size ma)]
       (if (n/= +0 arr-size)
@@ -196,7 +196,7 @@
                    (list.n/range +0 (dec arr-size)))
         ))))
 
-(struct: #export _ (Fold Array)
+(structure: #export _ (Fold Array)
   (def: (fold f init xs)
     (let [arr-size (size xs)]
       (loop [so-far init
diff --git a/stdlib/source/lux/data/coll/bits.lux b/stdlib/source/lux/data/coll/bits.lux
index 94d3398a0..426f830d2 100644
--- a/stdlib/source/lux/data/coll/bits.lux
+++ b/stdlib/source/lux/data/coll/bits.lux
@@ -151,7 +151,7 @@
   [xor bit.xor]
   )
 
-(struct: #export _ (Equivalence Bits)
+(structure: #export _ (Equivalence Bits)
   (def: (= reference sample)
     (let [size (n/max (array.size reference)
                       (array.size sample))]
diff --git a/stdlib/source/lux/data/coll/dictionary/ordered.lux b/stdlib/source/lux/data/coll/dictionary/ordered.lux
index 6fbcb5a42..5c616fa0b 100644
--- a/stdlib/source/lux/data/coll/dictionary/ordered.lux
+++ b/stdlib/source/lux/data/coll/dictionary/ordered.lux
@@ -551,7 +551,7 @@
   [values  v     (get@ #value node')]
   )
 
-(struct: #export (Equivalence<Dict> Equivalence<v>) (All [k v] (-> (Equivalence v) (Equivalence (Dict k v))))
+(structure: #export (Equivalence<Dict> Equivalence<v>) (All [k v] (-> (Equivalence v) (Equivalence (Dict k v))))
   (def: (= reference sample)
     (let [Equivalence<k> (:: sample eq)]
       (loop [entriesR (entries reference)
diff --git a/stdlib/source/lux/data/coll/dictionary/unordered.lux b/stdlib/source/lux/data/coll/dictionary/unordered.lux
index bb6d12b24..61d21b425 100644
--- a/stdlib/source/lux/data/coll/dictionary/unordered.lux
+++ b/stdlib/source/lux/data/coll/dictionary/unordered.lux
@@ -671,7 +671,7 @@
                keys)))
 
 ## [Structures]
-(struct: #export (Equivalence<Dict> Equivalence<v>) (All [k v] (-> (Equivalence v) (Equivalence (Dict k v))))
+(structure: #export (Equivalence<Dict> Equivalence<v>) (All [k v] (-> (Equivalence v) (Equivalence (Dict k v))))
   (def: (= test subject)
     (and (n/= (size test)
               (size subject))
diff --git a/stdlib/source/lux/data/coll/list.lux b/stdlib/source/lux/data/coll/list.lux
index 4049fce8e..74ef2e5cc 100644
--- a/stdlib/source/lux/data/coll/list.lux
+++ b/stdlib/source/lux/data/coll/list.lux
@@ -16,7 +16,7 @@
 ##   (#Cons a (List a)))
 
 ## [Functions]
-(struct: #export _ (fold.Fold List)
+(structure: #export _ (fold.Fold List)
   (def: (fold f init xs)
     (case xs
       #.Nil
@@ -265,7 +265,7 @@
       (nth (dec i) xs'))))
 
 ## [Structures]
-(struct: #export (Equivalence<List> Equivalence<a>)
+(structure: #export (Equivalence<List> Equivalence<a>)
   (All [a] (-> (Equivalence a) (Equivalence (List a))))
   (def: (= xs ys)
     (case [xs ys]
@@ -280,7 +280,7 @@
       false
       )))
 
-(struct: #export Monoid<List> (All [a]
+(structure: #export Monoid<List> (All [a]
                                 (Monoid (List a)))
   (def: identity #.Nil)
   (def: (compose xs ys)
@@ -290,7 +290,7 @@
 
 (open: Monoid<List>)
 
-(struct: #export _ (Functor List)
+(structure: #export _ (Functor List)
   (def: (map f ma)
     (case ma
       #.Nil          #.Nil
@@ -298,7 +298,7 @@
 
 (open: Functor<List>)
 
-(struct: #export _ (Apply List)
+(structure: #export _ (Apply List)
   (def: functor Functor<List>)
 
   (def: (apply ff fa)
@@ -309,7 +309,7 @@
       (#.Cons f ff')
       (compose (map f fa) (apply ff' fa)))))
 
-(struct: #export _ (Monad List)
+(structure: #export _ (Monad List)
   (def: functor Functor<List>)
 
   (def: (wrap a)
@@ -511,7 +511,7 @@
   (All [a] (-> (List (List a)) (List a)))
   (:: Monad<List> join xss))
 
-(struct: #export (ListT Monad<M>)
+(structure: #export (ListT Monad<M>)
   (All [M] (-> (Monad M) (Monad (All [a] (M (List a))))))
 
   (def: functor (functor.compose (get@ #monad.functor Monad<M>) Functor<List>))
diff --git a/stdlib/source/lux/data/coll/queue.lux b/stdlib/source/lux/data/coll/queue.lux
index 490351d29..3b144a52a 100644
--- a/stdlib/source/lux/data/coll/queue.lux
+++ b/stdlib/source/lux/data/coll/queue.lux
@@ -67,12 +67,12 @@
     _
     (update@ #rear (|>> (#.Cons val)) queue)))
 
-(struct: #export (Equivalence<Queue> Equivalence<a>)
+(structure: #export (Equivalence<Queue> Equivalence<a>)
   (All [a] (-> (Equivalence a) (Equivalence (Queue a))))
   (def: (= qx qy)
     (:: (list.Equivalence<List> Equivalence<a>) = (to-list qx) (to-list qy))))
 
-(struct: #export _ (F.Functor Queue)
+(structure: #export _ (F.Functor Queue)
   (def: (map f fa)
     {#front (|> fa (get@ #front) (L/map f))
      #rear (|> fa (get@ #rear) (L/map f))}))
diff --git a/stdlib/source/lux/data/coll/row.lux b/stdlib/source/lux/data/coll/row.lux
index 2c50120ec..1d4dc648c 100644
--- a/stdlib/source/lux/data/coll/row.lux
+++ b/stdlib/source/lux/data/coll/row.lux
@@ -343,7 +343,7 @@
   (wrap (list (` (from-list (list (~+ elems)))))))
 
 ## [Structures]
-(struct: #export (Equivalence<Node> Equivalence<a>) (All [a] (-> (Equivalence a) (Equivalence (Node a))))
+(structure: #export (Equivalence<Node> Equivalence<a>) (All [a] (-> (Equivalence a) (Equivalence (Node a))))
   (def: (= v1 v2)
     (case [v1 v2]
       [(#Base b1) (#Base b2)]
@@ -355,7 +355,7 @@
       _
       false)))
 
-(struct: #export (Equivalence<Row> Equivalence<a>) (All [a] (-> (Equivalence a) (Equivalence (Row a))))
+(structure: #export (Equivalence<Row> Equivalence<a>) (All [a] (-> (Equivalence a) (Equivalence (Row a))))
   (def: (= v1 v2)
     (and (n/= (get@ #size v1) (get@ #size v2))
          (let [(^open "Node/") (Equivalence<Node> Equivalence<a>)]
@@ -364,7 +364,7 @@
                 (Node/= (#Hierarchy (get@ #root v1))
                         (#Hierarchy (get@ #root v2))))))))
 
-(struct: _ (Fold Node)
+(structure: _ (Fold Node)
   (def: (fold f init xs)
     (case xs
       (#Base base)
@@ -376,7 +376,7 @@
                   hierarchy))
     ))
 
-(struct: #export _ (Fold Row)
+(structure: #export _ (Fold Row)
   (def: (fold f init xs)
     (let [(^open) Fold<Node>]
       (fold f
@@ -386,12 +386,12 @@
             (#Base (get@ #tail xs))))
     ))
 
-(struct: #export Monoid<Row> (All [a] (Monoid (Row a)))
+(structure: #export Monoid<Row> (All [a] (Monoid (Row a)))
   (def: identity empty)
   (def: (compose xs ys)
     (list/fold add xs (to-list ys))))
 
-(struct: _ (Functor Node)
+(structure: _ (Functor Node)
   (def: (map f xs)
     (case xs
       (#Base base)
@@ -401,7 +401,7 @@
       (#Hierarchy (array/map (map f) hierarchy)))
     ))
 
-(struct: #export _ (Functor Row)
+(structure: #export _ (Functor Row)
   (def: (map f xs)
     {#level (get@ #level xs)
      #size (get@ #size xs)
@@ -409,7 +409,7 @@
      #tail (|> xs (get@ #tail) (array/map f))
      }))
 
-(struct: #export _ (Apply Row)
+(structure: #export _ (Apply Row)
   (def: functor Functor<Row>)
 
   (def: (apply ff fa)
@@ -420,7 +420,7 @@
                        ff)]
       (fold compose identity results))))
 
-(struct: #export _ (Monad Row)
+(structure: #export _ (Monad Row)
   (def: functor Functor<Row>)
 
   (def: wrap (|>> row))
diff --git a/stdlib/source/lux/data/coll/sequence.lux b/stdlib/source/lux/data/coll/sequence.lux
index b8908403b..ab8f1d625 100644
--- a/stdlib/source/lux/data/coll/sequence.lux
+++ b/stdlib/source/lux/data/coll/sequence.lux
@@ -117,12 +117,12 @@
   [(filter p xs) (filter (complement p) xs)])
 
 ## [Structures]
-(struct: #export _ (Functor Sequence)
+(structure: #export _ (Functor Sequence)
   (def: (map f fa)
     (let [[h t] (continuation.run fa)]
       (pending [(f h) (map f t)]))))
 
-(struct: #export _ (CoMonad Sequence)
+(structure: #export _ (CoMonad Sequence)
   (def: functor Functor<Sequence>)
   (def: unwrap head)
   (def: (split wa)
diff --git a/stdlib/source/lux/data/coll/set/ordered.lux b/stdlib/source/lux/data/coll/set/ordered.lux
index 0862d62c2..45a6b0cb0 100644
--- a/stdlib/source/lux/data/coll/set/ordered.lux
+++ b/stdlib/source/lux/data/coll/set/ordered.lux
@@ -80,7 +80,7 @@
   (All [a] (-> (Set a) (Set a) Bool))
   (sub? super sub))
 
-(struct: #export Equivalence<Set> (All [a] (Equivalence (Set a)))
+(structure: #export Equivalence<Set> (All [a] (Equivalence (Set a)))
   (def: (= reference sample)
     (:: (list.Equivalence<List> (:: sample eq))
         = (to-list reference) (to-list sample))))
diff --git a/stdlib/source/lux/data/coll/set/unordered.lux b/stdlib/source/lux/data/coll/set/unordered.lux
index 4fcc0c1cc..6f0007412 100644
--- a/stdlib/source/lux/data/coll/set/unordered.lux
+++ b/stdlib/source/lux/data/coll/set/unordered.lux
@@ -63,11 +63,11 @@
   (sub? super sub))
 
 ## [Structures]
-(struct: #export Equivalence<Set> (All [a] (Equivalence (Set a)))
+(structure: #export Equivalence<Set> (All [a] (Equivalence (Set a)))
   (def: (= (^@ test [Hash<a> _]) subject)
     (:: (list.Equivalence<List> (get@ #hash.eq Hash<a>)) = (to-list test) (to-list subject))))
 
-(struct: #export Hash<Set> (All [a] (Hash (Set a)))
+(structure: #export Hash<Set> (All [a] (Hash (Set a)))
   (def: eq Equivalence<Set>)
   
   (def: (hash (^@ set [Hash<a> _]))
diff --git a/stdlib/source/lux/data/coll/tree/rose.lux b/stdlib/source/lux/data/coll/tree/rose.lux
index 8171dcdaa..1fb5fc85a 100644
--- a/stdlib/source/lux/data/coll/tree/rose.lux
+++ b/stdlib/source/lux/data/coll/tree/rose.lux
@@ -54,18 +54,18 @@
                           #children (list (~+ (L/map recur children)))})))))))
 
 ## [Structs]
-(struct: #export (Equivalence<Tree> Equivalence<a>) (All [a] (-> (Equivalence a) (Equivalence (Tree a))))
+(structure: #export (Equivalence<Tree> Equivalence<a>) (All [a] (-> (Equivalence a) (Equivalence (Tree a))))
   (def: (= tx ty)
     (and (:: Equivalence<a> = (get@ #value tx) (get@ #value ty))
          (:: (list.Equivalence<List> (Equivalence<Tree> Equivalence<a>)) = (get@ #children tx) (get@ #children ty)))))
 
-(struct: #export _ (Functor Tree)
+(structure: #export _ (Functor Tree)
   (def: (map f fa)
     {#value (f (get@ #value fa))
      #children (L/map (map f)
                       (get@ #children fa))}))
 
-(struct: #export _ (Fold Tree)
+(structure: #export _ (Fold Tree)
   (def: (fold f init tree)
     (L/fold (function (_ tree' init') (fold f init' tree'))
             (f (get@ #value tree)
diff --git a/stdlib/source/lux/data/coll/tree/rose/zipper.lux b/stdlib/source/lux/data/coll/tree/rose/zipper.lux
index 845dd4c4c..ba47b9f0a 100644
--- a/stdlib/source/lux/data/coll/tree/rose/zipper.lux
+++ b/stdlib/source/lux/data/coll/tree/rose/zipper.lux
@@ -211,7 +211,7 @@
   [insert-right #rights]
   )
 
-(struct: #export _ (Functor Zipper)
+(structure: #export _ (Functor Zipper)
   (def: (map f fa)
     {#parent (|> fa (get@ #parent) (M/map (map f)))
      #lefts (|> fa (get@ #lefts) (L/map (T/map f)))
@@ -219,7 +219,7 @@
      #node (T/map f (get@ #node fa))}))
 
 ## TODO: Add again once new-luxc becomes the standard compiler.
-## (struct: #export _ (CoMonad Zipper)
+## (structure: #export _ (CoMonad Zipper)
 ##   (def: functor Functor<Zipper>)
 
 ##   (def: unwrap (get@ [#node #rose.value]))
diff --git a/stdlib/source/lux/data/color.lux b/stdlib/source/lux/data/color.lux
index 67c9c3388..7a23be703 100644
--- a/stdlib/source/lux/data/color.lux
+++ b/stdlib/source/lux/data/color.lux
@@ -33,7 +33,7 @@
     (-> Color [Nat Nat Nat])
     (|>> :representation))
 
-  (struct: #export _ (eq.Equivalence Color)
+  (structure: #export _ (eq.Equivalence Color)
     (def: (= reference sample)
       (let [[rr rg rb] (:representation reference)
             [sr sg sb] (:representation sample)]
diff --git a/stdlib/source/lux/data/env.lux b/stdlib/source/lux/data/env.lux
index 880bfa621..68d0affc0 100644
--- a/stdlib/source/lux/data/env.lux
+++ b/stdlib/source/lux/data/env.lux
@@ -7,11 +7,11 @@
   {#env e
    #value a})
 
-(struct: #export Functor<Env> (All [e] (F.Functor (Env e)))
+(structure: #export Functor<Env> (All [e] (F.Functor (Env e)))
   (def: (map f fa)
     (update@ #value f fa)))
 
-(struct: #export CoMonad<Env> (All [e] (CoMonad (Env e)))
+(structure: #export CoMonad<Env> (All [e] (CoMonad (Env e)))
   (def: functor Functor<Env>)
 
   (def: unwrap (get@ #value))
diff --git a/stdlib/source/lux/data/error.lux b/stdlib/source/lux/data/error.lux
index 5e7f07601..6e9f12cb0 100644
--- a/stdlib/source/lux/data/error.lux
+++ b/stdlib/source/lux/data/error.lux
@@ -10,13 +10,13 @@
   (#Success a))
 
 ## [Structures]
-(struct: #export _ (F.Functor Error)
+(structure: #export _ (F.Functor Error)
   (def: (map f ma)
     (case ma
       (#Error msg)     (#Error msg)
       (#Success datum) (#Success (f datum)))))
 
-(struct: #export _ (A.Apply Error)
+(structure: #export _ (A.Apply Error)
   (def: functor Functor<Error>)
 
   (def: (apply ff fa)
@@ -33,7 +33,7 @@
       (#Error msg))
     ))
 
-(struct: #export _ (Monad Error)
+(structure: #export _ (Monad Error)
   (def: functor Functor<Error>)
 
   (def: (wrap a)
@@ -44,7 +44,7 @@
       (#Error msg) (#Error msg)
       (#Success ma) ma)))
 
-(struct: #export (ErrorT Monad<M>)
+(structure: #export (ErrorT Monad<M>)
   (All [M] (-> (Monad M) (Monad (All [a] (M (Error a))))))
   
   (def: functor (F.compose (get@ #M.functor Monad<M>) Functor<Error>))
diff --git a/stdlib/source/lux/data/format/json.lux b/stdlib/source/lux/data/format/json.lux
index 984fbb1aa..01652968f 100644
--- a/stdlib/source/lux/data/format/json.lux
+++ b/stdlib/source/lux/data/format/json.lux
@@ -147,7 +147,7 @@
   [get-object  #Object  Object  "objects"]
   )
 
-(struct: #export _ (Equivalence JSON)
+(structure: #export _ (Equivalence JSON)
   (def: (= x y)
     (case [x y]
       [#Null #Null]
@@ -495,6 +495,6 @@
   (-> Any (l.Lexer JSON))
   ($_ p.alt null~ boolean~ number~ string~ (array~ json~') (object~ json~')))
 
-(struct: #export _ (Codec Text JSON)
+(structure: #export _ (Codec Text JSON)
   (def: encode show-json)
   (def: decode (function (_ input) (l.run input (json~' [])))))
diff --git a/stdlib/source/lux/data/format/xml.lux b/stdlib/source/lux/data/format/xml.lux
index 7d1614fca..ddfb06249 100644
--- a/stdlib/source/lux/data/format/xml.lux
+++ b/stdlib/source/lux/data/format/xml.lux
@@ -220,11 +220,11 @@
                       (text.join-with ""))
                   "</" tag ">")))))))
 
-(struct: #export _ (Codec Text XML)
+(structure: #export _ (Codec Text XML)
   (def: encode write)
   (def: decode read))
 
-(struct: #export _ (Equivalence XML)
+(structure: #export _ (Equivalence XML)
   (def: (= reference sample)
     (case [reference sample]
       [(#Text reference/value) (#Text sample/value)]
diff --git a/stdlib/source/lux/data/ident.lux b/stdlib/source/lux/data/ident.lux
index cb0b35b1f..f75b89ab8 100644
--- a/stdlib/source/lux/data/ident.lux
+++ b/stdlib/source/lux/data/ident.lux
@@ -20,12 +20,12 @@
   )
 
 ## [Structures]
-(struct: #export _ (Equivalence Ident)
+(structure: #export _ (Equivalence Ident)
   (def: (= [xmodule xname] [ymodule yname])
     (and (text/= xmodule ymodule)
          (text/= xname yname))))
 
-(struct: #export _ (Codec Text Ident)
+(structure: #export _ (Codec Text Ident)
   (def: (encode [module name])
     (case module
       "" name
@@ -44,7 +44,7 @@
         _
         (#.Left (text/compose "Invalid format for Ident: " input))))))
 
-(struct: #export _ (Hash Ident)
+(structure: #export _ (Hash Ident)
   (def: eq Equivalence<Ident>)
   
   (def: (hash [module name])
diff --git a/stdlib/source/lux/data/identity.lux b/stdlib/source/lux/data/identity.lux
index b14658619..969b89e4d 100644
--- a/stdlib/source/lux/data/identity.lux
+++ b/stdlib/source/lux/data/identity.lux
@@ -10,20 +10,20 @@
   a)
 
 ## [Structures]
-(struct: #export _ (F.Functor Identity)
+(structure: #export _ (F.Functor Identity)
   (def: map id))
 
-(struct: #export _ (A.Apply Identity)
+(structure: #export _ (A.Apply Identity)
   (def: functor Functor<Identity>)
   (def: (apply ff fa)
     (ff fa)))
 
-(struct: #export _ (Monad Identity)
+(structure: #export _ (Monad Identity)
   (def: functor Functor<Identity>)
   (def: wrap id)
   (def: join id))
 
-(struct: #export _ (CoMonad Identity)
+(structure: #export _ (CoMonad Identity)
   (def: functor Functor<Identity>)
   (def: unwrap id)
   (def: split id))
diff --git a/stdlib/source/lux/data/lazy.lux b/stdlib/source/lux/data/lazy.lux
index 94932a497..5a7228935 100644
--- a/stdlib/source/lux/data/lazy.lux
+++ b/stdlib/source/lux/data/lazy.lux
@@ -33,16 +33,16 @@
   (with-gensyms [g!_]
     (wrap (list (` ((~! freeze') (function ((~ g!_) (~ g!_)) (~ expr))))))))
 
-(struct: #export _ (Functor Lazy)
+(structure: #export _ (Functor Lazy)
   (def: (map f fa)
     (freeze (f (thaw fa)))))
 
-(struct: #export _ (Apply Lazy)
+(structure: #export _ (Apply Lazy)
   (def: functor Functor<Lazy>)
   (def: (apply ff fa)
     (freeze ((thaw ff) (thaw fa)))))
 
-(struct: #export _ (Monad Lazy)
+(structure: #export _ (Monad Lazy)
   (def: functor Functor<Lazy>)
   (def: wrap (|>> freeze))
   (def: join thaw))
diff --git a/stdlib/source/lux/data/maybe.lux b/stdlib/source/lux/data/maybe.lux
index bfdb0fbe5..dfc2a557b 100644
--- a/stdlib/source/lux/data/maybe.lux
+++ b/stdlib/source/lux/data/maybe.lux
@@ -12,20 +12,20 @@
 ##   (#.Some a))
 
 ## [Structures]
-(struct: #export Monoid<Maybe> (All [a] (m.Monoid (Maybe a)))
+(structure: #export Monoid<Maybe> (All [a] (m.Monoid (Maybe a)))
   (def: identity #.None)
   (def: (compose xs ys)
     (case xs
       #.None     ys
       (#.Some x) (#.Some x))))
 
-(struct: #export _ (F.Functor Maybe)
+(structure: #export _ (F.Functor Maybe)
   (def: (map f ma)
     (case ma
       #.None     #.None
       (#.Some a) (#.Some (f a)))))
 
-(struct: #export _ (A.Apply Maybe)
+(structure: #export _ (A.Apply Maybe)
   (def: functor Functor<Maybe>)
 
   (def: (apply ff fa)
@@ -36,7 +36,7 @@
       _
       #.None)))
 
-(struct: #export _ (Monad Maybe)
+(structure: #export _ (Monad Maybe)
   (def: functor Functor<Maybe>)
 
   (def: (wrap x)
@@ -47,7 +47,7 @@
       #.None      #.None
       (#.Some xs) xs)))
 
-(struct: #export (Equivalence<Maybe> Equivalence<a>) (All [a] (-> (Equivalence a) (Equivalence (Maybe a))))
+(structure: #export (Equivalence<Maybe> Equivalence<a>) (All [a] (-> (Equivalence a) (Equivalence (Maybe a))))
   (def: (= mx my)
     (case [mx my]
       [#.None #.None]
@@ -59,7 +59,7 @@
       _
       false)))
 
-(struct: #export (MaybeT Monad<M>)
+(structure: #export (MaybeT Monad<M>)
   (All [M] (-> (Monad M) (Monad (All [a] (M (Maybe a))))))
 
   (def: functor (F.compose (get@ #monad.functor Monad<M>) Functor<Maybe>))
diff --git a/stdlib/source/lux/data/number.lux b/stdlib/source/lux/data/number.lux
index 637d0d0ba..5a32e6ada 100644
--- a/stdlib/source/lux/data/number.lux
+++ b/stdlib/source/lux/data/number.lux
@@ -14,7 +14,7 @@
 
 ## [Structures]
 (do-template [<type> <test>]
-  [(struct: #export _ (Equivalence <type>)
+  [(structure: #export _ (Equivalence <type>)
      (def: = <test>))]
 
   [ Nat n/=]
@@ -24,7 +24,7 @@
   )
 
 (do-template [<type> <eq> <lt> <lte> <gt> <gte>]
-  [(struct: #export _ (order.Order <type>)
+  [(structure: #export _ (order.Order <type>)
      (def: eq <eq>)
      (def: < <lt>)
      (def: <= <lte>)
@@ -37,7 +37,7 @@
   [Frac Equivalence<Frac> f/< f/<= f/> f/>=]
   )
 
-(struct: #export _ (Number Nat)
+(structure: #export _ (Number Nat)
   (def: + n/+)
   (def: - n/-)
   (def: * n/*)
@@ -52,7 +52,7 @@
   )
 
 (do-template [<type> <order> <+> <-> <*> </> <%> <=> <<> <0> <1> <-1>]
-  [(struct: #export _ (Number <type>)
+  [(structure: #export _ (Number <type>)
      (def: + <+>)
      (def: - <->)
      (def: * <*>)
@@ -74,7 +74,7 @@
   [Frac Order<Frac> f/+ f/- f/* f// f/% f/= f/< 0.0 1.0 -1.0]
   )
 
-(struct: #export _ (Number Rev)
+(structure: #export _ (Number Rev)
   (def: + r/+)
   (def: - r/-)
   (def: * r/*)
@@ -86,7 +86,7 @@
     (:coerce Rev -1)))
 
 (do-template [<type> <order> <succ> <pred>]
-  [(struct: #export _ (Enum <type>)
+  [(structure: #export _ (Enum <type>)
      (def: order <order>)
      (def: succ <succ>)
      (def: pred <pred>))]
@@ -98,7 +98,7 @@
   )
 
 (do-template [<type> <enum> <top> <bottom>]
-  [(struct: #export _ (Interval <type>)
+  [(structure: #export _ (Interval <type>)
      (def: enum <enum>)
      (def: top <top>)
      (def: bottom <bottom>))]
@@ -110,7 +110,7 @@
   )
 
 (do-template [<name> <type> <identity> <compose>]
-  [(struct: #export <name> (Monoid <type>)
+  [(structure: #export <name> (Monoid <type>)
      (def: identity <identity>)
      (def: compose <compose>))]
 
@@ -155,7 +155,7 @@
            (f/= negative-infinity value))))
 
 (do-template [<type> <encoder> <decoder> <error>]
-  [(struct: #export _ (Codec Text <type>)
+  [(structure: #export _ (Codec Text <type>)
      (def: (encode x)
        (<encoder> [x]))
 
@@ -288,7 +288,7 @@
     _ #.None))
 
 (do-template [<struct> <base> <to-character> <to-value> <error>]
-  [(struct: #export <struct> (Codec Text Nat)
+  [(structure: #export <struct> (Codec Text Nat)
      (def: (encode value)
        (loop [input value
               output ""]
@@ -328,7 +328,7 @@
   )
 
 (do-template [<struct> <base> <to-character> <to-value> <error>]
-  [(struct: #export <struct> (Codec Text Int)
+  [(structure: #export <struct> (Codec Text Int)
      (def: (encode value)
        (if (i/= 0 value)
          "0"
@@ -379,7 +379,7 @@
   (maybe.assume ("lux text clip" input +1 ("lux text size" input))))
 
 (do-template [<struct> <nat> <char-bit-size> <error>]
-  [(struct: #export <struct> (Codec Text Rev)
+  [(structure: #export <struct> (Codec Text Rev)
      (def: (encode value)
        (let [raw-output (de-prefix (:: <nat> encode (:coerce Nat value)))
              max-num-chars (n// <char-bit-size> +64)
@@ -412,7 +412,7 @@
   )
 
 (do-template [<struct> <int> <base> <char-set> <error>]
-  [(struct: #export <struct> (Codec Text Frac)
+  [(structure: #export <struct> (Codec Text Frac)
      (def: (encode value)
        (let [whole (frac-to-int value)
              whole-part (:: <int> encode whole)
@@ -602,7 +602,7 @@
   )
 
 (do-template [<struct> <error> <from> <to>]
-  [(struct: #export <struct> (Codec Text Frac)
+  [(structure: #export <struct> (Codec Text Frac)
      (def: (encode value)
        (let [sign (:: Number<Frac> signum value)
              raw-bin (:: Binary@Codec<Text,Frac> encode value)
@@ -853,7 +853,7 @@
              (digits-sub-once! idx (digits-get idx param) output))
       output)))
 
-(struct: #export _ (Codec Text Rev)
+(structure: #export _ (Codec Text Rev)
   (def: (encode input)
     (let [input (:coerce Nat input)
           last-idx (dec bit.width)]
@@ -994,19 +994,19 @@
               (f/* -1.0 shifted))))))
 
 ## [Hash]
-(struct: #export _ (Hash Nat)
+(structure: #export _ (Hash Nat)
   (def: eq Equivalence<Nat>)
   (def: hash id))
 
-(struct: #export _ (Hash Int)
+(structure: #export _ (Hash Int)
   (def: eq Equivalence<Int>)
   (def: hash .nat))
 
-(struct: #export _ (Hash Frac)
+(structure: #export _ (Hash Frac)
   (def: eq Equivalence<Frac>)
   
   (def: hash frac-to-bits))
 
-(struct: #export _ (Hash Rev)
+(structure: #export _ (Hash Rev)
   (def: eq Equivalence<Rev>)
   (def: hash (|>> (:coerce Nat))))
diff --git a/stdlib/source/lux/data/number/complex.lux b/stdlib/source/lux/data/number/complex.lux
index a7e535f08..91a10fd59 100644
--- a/stdlib/source/lux/data/number/complex.lux
+++ b/stdlib/source/lux/data/number/complex.lux
@@ -56,7 +56,7 @@
   [- f/-]
   )
 
-(struct: #export _ (Equivalence Complex)
+(structure: #export _ (Equivalence Complex)
   (def: = ..=))
 
 (def: #export negate
@@ -187,7 +187,7 @@
                         (frac/abs real))))
                ))))
 
-(struct: #export _ (Number Complex)
+(structure: #export _ (Number Complex)
   (def: + ..+)
   (def: - ..-)
   (def: * ..*)
diff --git a/stdlib/source/lux/data/number/ratio.lux b/stdlib/source/lux/data/number/ratio.lux
index c96c66882..b23128348 100644
--- a/stdlib/source/lux/data/number/ratio.lux
+++ b/stdlib/source/lux/data/number/ratio.lux
@@ -100,17 +100,17 @@
   [max >]
   )
 
-(struct: #export _ (Equivalence Ratio)
+(structure: #export _ (Equivalence Ratio)
   (def: = ..=))
 
-(struct: #export _ (order.Order Ratio)
+(structure: #export _ (order.Order Ratio)
   (def: eq Equivalence<Ratio>)
   (def: < ..<)
   (def: <= ..<=)
   (def: > ..>)
   (def: >= ..>=))
 
-(struct: #export _ (Number Ratio)
+(structure: #export _ (Number Ratio)
   (def: + ..+)
   (def: - ..-)
   (def: * ..*)
@@ -134,7 +134,7 @@
   (-> Text (E.Error Nat))
   (|>> (format "+") nat/decode))
 
-(struct: #export _ (Codec Text Ratio)
+(structure: #export _ (Codec Text Ratio)
   (def: (encode (^slots [#numerator #denominator]))
     ($_ text/compose (part-encode numerator) separator (part-encode denominator)))
 
diff --git a/stdlib/source/lux/data/store.lux b/stdlib/source/lux/data/store.lux
index 06b1315a2..96e4988b3 100644
--- a/stdlib/source/lux/data/store.lux
+++ b/stdlib/source/lux/data/store.lux
@@ -13,13 +13,13 @@
   {#cursor (get@ #cursor wa)
    #peek (function (_ s) (f (set@ #cursor s wa)))})
 
-(struct: #export Functor<Store> (All [s] (F.Functor (Store s)))
+(structure: #export Functor<Store> (All [s] (F.Functor (Store s)))
   (def: (map f fa)
     (extend (function (_ store)
               (f (:: store peek (:: store cursor))))
             fa)))
 
-(struct: #export CoMonad<Store> (All [s] (CoMonad (Store s)))
+(structure: #export CoMonad<Store> (All [s] (CoMonad (Store s)))
   (def: functor Functor<Store>)
 
   (def: (unwrap wa) (::: peek (::: cursor)))
diff --git a/stdlib/source/lux/data/text.lux b/stdlib/source/lux/data/text.lux
index 04af675c4..d09b713c9 100644
--- a/stdlib/source/lux/data/text.lux
+++ b/stdlib/source/lux/data/text.lux
@@ -123,11 +123,11 @@
   (split-all-with "\n"))
 
 ## [Structures]
-(struct: #export _ (Equivalence Text)
+(structure: #export _ (Equivalence Text)
   (def: (= test subject)
     ("lux text =" subject test)))
 
-(struct: #export _ (order.Order Text)
+(structure: #export _ (order.Order Text)
   (def: eq Equivalence<Text>)
 
   (def: (< test subject)
@@ -145,7 +145,7 @@
         ("lux text =" test subject)))
   )
 
-(struct: #export _ (Monoid Text)
+(structure: #export _ (Monoid Text)
   (def: identity "")
   (def: (compose left right)
     ("lux text concat" left right)))
@@ -166,7 +166,7 @@
                     )]
     ($_ text/compose "\"" escaped "\"")))
 
-(struct: #export _ (Hash Text)
+(structure: #export _ (Hash Text)
   (def: eq Equivalence<Text>)
   
   (def: (hash input)
diff --git a/stdlib/source/lux/data/text/unicode.lux b/stdlib/source/lux/data/text/unicode.lux
index 6f76d053b..e00f23e84 100644
--- a/stdlib/source/lux/data/text/unicode.lux
+++ b/stdlib/source/lux/data/text/unicode.lux
@@ -15,7 +15,7 @@
 
   (def: empty (:abstraction (interval.between number.Enum<Nat> nat/top nat/bottom)))
 
-  (struct: _ (Monoid Segment)
+  (structure: _ (Monoid Segment)
     (def: identity ..empty)
     (def: (compose left right)
       (let [left (:representation left)
diff --git a/stdlib/source/lux/data/trace.lux b/stdlib/source/lux/data/trace.lux
index 5bd37bbca..9958d94be 100644
--- a/stdlib/source/lux/data/trace.lux
+++ b/stdlib/source/lux/data/trace.lux
@@ -9,11 +9,11 @@
   {#monoid (Monoid t)
    #trace (-> t a)})
 
-(struct: #export Functor<Trace> (All [t] (Functor (Trace t)))
+(structure: #export Functor<Trace> (All [t] (Functor (Trace t)))
   (def: (map f fa)
     (update@ #trace (compose f) fa)))
 
-(struct: #export CoMonad<Trace> (All [t] (CoMonad (Trace t)))
+(structure: #export CoMonad<Trace> (All [t] (CoMonad (Trace t)))
   (def: functor Functor<Trace>)
 
   (def: (unwrap wa)
diff --git a/stdlib/source/lux/function.lux b/stdlib/source/lux/function.lux
index 919e19371..5c318eb78 100644
--- a/stdlib/source/lux/function.lux
+++ b/stdlib/source/lux/function.lux
@@ -19,6 +19,6 @@
     (-> (-> a b c) (-> b a c)))
   (function (_ x y) (f y x)))
 
-(struct: #export Monoid<Function> (All [a] (Monoid (-> a a)))
+(structure: #export Monoid<Function> (All [a] (Monoid (-> a a)))
   (def: identity id)
   (def: compose ..compose))
diff --git a/stdlib/source/lux/io.lux b/stdlib/source/lux/io.lux
index 726191aea..7579a1463 100644
--- a/stdlib/source/lux/io.lux
+++ b/stdlib/source/lux/io.lux
@@ -25,17 +25,17 @@
     _
     (#.Left "Wrong syntax for io")))
 
-(struct: #export _ (Functor IO)
+(structure: #export _ (Functor IO)
   (def: (map f ma)
     (io (f (ma (:coerce Nothing []))))))
 
-(struct: #export _ (Apply IO)
+(structure: #export _ (Apply IO)
   (def: functor Functor<IO>)
 
   (def: (apply ff fa)
     (io ((ff (:coerce Nothing [])) (fa (:coerce Nothing []))))))
 
-(struct: #export _ (Monad IO)
+(structure: #export _ (Monad IO)
   (def: functor Functor<IO>)
 
   (def: (wrap x)
@@ -57,17 +57,17 @@
 (type: #export (Process a)
   (IO (Error a)))
 
-(struct: #export _ (Functor Process)
+(structure: #export _ (Functor Process)
   (def: (map f ma)
     (io (:: e.Functor<Error> map f (run ma)))))
 
-(struct: #export _ (Apply Process)
+(structure: #export _ (Apply Process)
   (def: functor Functor<Process>)
 
   (def: (apply ff fa)
     (io (:: e.Apply<Error> apply (run ff) (run fa)))))
 
-(struct: #export _ (Monad Process)
+(structure: #export _ (Monad Process)
   (def: functor Functor<Process>)
 
   (def: (wrap x)
diff --git a/stdlib/source/lux/lang/compiler/analysis/case/coverage.lux b/stdlib/source/lux/lang/compiler/analysis/case/coverage.lux
index c6a36e022..825a9e9df 100644
--- a/stdlib/source/lux/lang/compiler/analysis/case/coverage.lux
+++ b/stdlib/source/lux/lang/compiler/analysis/case/coverage.lux
@@ -142,7 +142,7 @@
     _
     (list coverage)))
 
-(struct: _ (Equivalence Coverage)
+(structure: _ (Equivalence Coverage)
   (def: (= reference sample)
     (case [reference sample]
       [#Exhaustive #Exhaustive]
diff --git a/stdlib/source/lux/lang/compiler/meta/archive.lux b/stdlib/source/lux/lang/compiler/meta/archive.lux
index 371164ee4..fa3b91d7c 100644
--- a/stdlib/source/lux/lang/compiler/meta/archive.lux
+++ b/stdlib/source/lux/lang/compiler/meta/archive.lux
@@ -30,7 +30,7 @@
 
   Signature
 
-  (struct: #export Equivalence<Key>
+  (structure: #export Equivalence<Key>
     (All [k] (Equivalence (Key k)))
     (def: (= reference sample)
       (:: Equivalence<Signature> = (:representation reference) (:representation sample))))
diff --git a/stdlib/source/lux/lang/reference.lux b/stdlib/source/lux/lang/reference.lux
index c76f78d87..43c8f0d48 100644
--- a/stdlib/source/lux/lang/reference.lux
+++ b/stdlib/source/lux/lang/reference.lux
@@ -14,7 +14,7 @@
   (#Variable Variable)
   (#Constant Ident))
 
-(struct: #export _ (Equivalence Variable)
+(structure: #export _ (Equivalence Variable)
   (def: (= reference sample)
     (case [reference sample]
       (^template [<tag>]
@@ -25,7 +25,7 @@
       _
       false)))
 
-(struct: #export _ (Hash Variable)
+(structure: #export _ (Hash Variable)
   (def: eq Equivalence<Variable>)
   (def: (hash var)
     (case var
diff --git a/stdlib/source/lux/lang/type.lux b/stdlib/source/lux/lang/type.lux
index 793d1c8be..8f3c2eb77 100644
--- a/stdlib/source/lux/lang/type.lux
+++ b/stdlib/source/lux/lang/type.lux
@@ -46,7 +46,7 @@
     ))
 
 ## [Structures]
-(struct: #export _ (Equivalence Type)
+(structure: #export _ (Equivalence Type)
   (def: (= x y)
     (case [x y]
       [(#.Primitive xname xparams) (#.Primitive yname yparams)]
diff --git a/stdlib/source/lux/lang/type/check.lux b/stdlib/source/lux/lang/type/check.lux
index 5e6ab2714..ab1b6be1d 100644
--- a/stdlib/source/lux/lang/type/check.lux
+++ b/stdlib/source/lux/lang/type/check.lux
@@ -44,7 +44,7 @@
 (type: #export Type-Vars
   (List [Var (Maybe Type)]))
 
-(struct: #export _ (Functor Check)
+(structure: #export _ (Functor Check)
   (def: (map f fa)
     (function (_ context)
       (case (fa context)
@@ -55,7 +55,7 @@
         (#e.Success [context' (f output)])
         ))))
 
-(struct: #export _ (Apply Check)
+(structure: #export _ (Apply Check)
   (def: functor Functor<Check>)
 
   (def: (apply ff fa)
@@ -74,7 +74,7 @@
         )))
   )
 
-(struct: #export _ (Monad Check)
+(structure: #export _ (Monad Check)
   (def: functor Functor<Check>)
 
   (def: (wrap x)
diff --git a/stdlib/source/lux/macro.lux b/stdlib/source/lux/macro.lux
index a8494f047..8aaa567ae 100644
--- a/stdlib/source/lux/macro.lux
+++ b/stdlib/source/lux/macro.lux
@@ -15,7 +15,7 @@
 ## (type: (Meta a)
 ##   (-> Lux (e.Error [Lux a])))
 
-(struct: #export _ (Functor Meta)
+(structure: #export _ (Functor Meta)
   (def: (map f fa)
     (function (_ compiler)
       (case (fa compiler)
@@ -25,7 +25,7 @@
         (#e.Success [compiler' a])
         (#e.Success [compiler' (f a)])))))
 
-(struct: #export _ (Apply Meta)
+(structure: #export _ (Apply Meta)
   (def: functor Functor<Meta>)
 
   (def: (apply ff fa)
@@ -42,7 +42,7 @@
         (#e.Error msg)
         (#e.Error msg)))))
 
-(struct: #export _ (Monad Meta)
+(structure: #export _ (Monad Meta)
   (def: functor Functor<Meta>)
 
   (def: (wrap x)
diff --git a/stdlib/source/lux/macro/code.lux b/stdlib/source/lux/macro/code.lux
index 1094d7e0e..42f575a57 100644
--- a/stdlib/source/lux/macro/code.lux
+++ b/stdlib/source/lux/macro/code.lux
@@ -56,7 +56,7 @@
   [local-tag    #.Tag    "Produces a local tag (a tag with no module prefix)."])
 
 ## [Structures]
-(struct: #export _ (Equivalence Code)
+(structure: #export _ (Equivalence Code)
   (def: (= x y)
     (case [x y]
       (^template [<tag> <eq>]
diff --git a/stdlib/source/lux/macro/poly/json.lux b/stdlib/source/lux/macro/poly/json.lux
index fd85087d7..2a708ee2e 100644
--- a/stdlib/source/lux/macro/poly/json.lux
+++ b/stdlib/source/lux/macro/poly/json.lux
@@ -43,7 +43,7 @@
 (def: low-mask Nat (|> +1 (bit.left-shift +32) dec))
 (def: high-mask Nat (|> low-mask (bit.left-shift +32)))
 
-(struct: _ (Codec JSON Nat)
+(structure: _ (Codec JSON Nat)
   (def: (encode input)
     (let [high (|> input (bit.and high-mask) (bit.logical-right-shift +32))
           low (bit.and low-mask input)]
@@ -58,7 +58,7 @@
         (wrap (n/+ (|> high frac-to-int .nat (bit.left-shift +32))
                    (|> low frac-to-int .nat))))))
 
-(struct: _ (Codec JSON Int)
+(structure: _ (Codec JSON Int)
   (def: encode (|>> .nat (:: Codec<JSON,Nat> encode)))
   (def: decode
     (|>> (:: Codec<JSON,Nat> decode) (:: e.Functor<Error> map .int))))
@@ -71,7 +71,7 @@
       #.None         #//.Null
       (#.Some value) (writer value))))
 
-(struct: Codec<JSON,Qty>
+(structure: Codec<JSON,Qty>
   (All [unit] (Codec JSON (unit.Qty unit)))
   (def: encode
     (|>> unit.out (:: Codec<JSON,Int> encode)))
diff --git a/stdlib/source/lux/math/modular.lux b/stdlib/source/lux/math/modular.lux
index 01e02a706..15b7f5193 100644
--- a/stdlib/source/lux/math/modular.lux
+++ b/stdlib/source/lux/math/modular.lux
@@ -83,7 +83,7 @@
 
   (def: separator Text " mod ")
 
-  (struct: #export (Codec<Text,Mod> modulus)
+  (structure: #export (Codec<Text,Mod> modulus)
     (All [m] (-> (Modulus m) (Codec Text (Mod m))))
 
     (def: (encode modular)
diff --git a/stdlib/source/lux/math/random.lux b/stdlib/source/lux/math/random.lux
index 5e560ea01..198095bc8 100644
--- a/stdlib/source/lux/math/random.lux
+++ b/stdlib/source/lux/math/random.lux
@@ -31,13 +31,13 @@
   {#.doc "A producer of random values based on a PRNG."}
   (-> PRNG [PRNG a]))
 
-(struct: #export _ (Functor Random)
+(structure: #export _ (Functor Random)
   (def: (map f fa)
     (function (_ state)
       (let [[state' a] (fa state)]
         [state' (f a)]))))
 
-(struct: #export _ (Apply Random)
+(structure: #export _ (Apply Random)
   (def: functor Functor<Random>)
 
   (def: (apply ff fa)
@@ -46,7 +46,7 @@
             [state'' a] (fa state')]
         [state'' (f a)]))))
 
-(struct: #export _ (Monad Random)
+(structure: #export _ (Monad Random)
   (def: functor Functor<Random>)
 
   (def: (wrap a)
diff --git a/stdlib/source/lux/time/date.lux b/stdlib/source/lux/time/date.lux
index f4680a6ca..38fc89800 100644
--- a/stdlib/source/lux/time/date.lux
+++ b/stdlib/source/lux/time/date.lux
@@ -29,7 +29,7 @@
   #November
   #December)
 
-(struct: #export _ (Equivalence Month)
+(structure: #export _ (Equivalence Month)
   (def: (= reference sample)
     (case [reference sample]
       (^template [<tag>]
@@ -67,7 +67,7 @@
     #November +10
     #December +11))
 
-(struct: #export _ (Order Month)
+(structure: #export _ (Order Month)
   (def: eq Equivalence<Month>)
   (do-template [<name> <comp>]
     [(def: (<name> reference sample)
@@ -79,7 +79,7 @@
     [>= n/>=]
     ))
 
-(struct: #export _ (Enum Month)
+(structure: #export _ (Enum Month)
   (def: order Order<Month>)
   (def: (succ month)
     (case month
@@ -119,7 +119,7 @@
   #Friday
   #Saturday)
 
-(struct: #export _ (Equivalence Day)
+(structure: #export _ (Equivalence Day)
   (def: (= reference sample)
     (case [reference sample]
       (^template [<tag>]
@@ -147,7 +147,7 @@
     #Friday    +5
     #Saturday  +6))
 
-(struct: #export _ (Order Day)
+(structure: #export _ (Order Day)
   (def: eq Equivalence<Day>)
   (do-template [<name> <comp>]
     [(def: (<name> reference sample)
@@ -159,7 +159,7 @@
     [>= n/>=]
     ))
 
-(struct: #export _ (Enum Day)
+(structure: #export _ (Enum Day)
   (def: order Order<Day>)
   (def: (succ day)
     (case day
@@ -185,7 +185,7 @@
    #month Month
    #day Nat})
 
-(struct: #export _ (Equivalence Date)
+(structure: #export _ (Equivalence Date)
   (def: (= reference sample)
     (and (i/= (get@ #year reference)
               (get@ #year sample))
@@ -205,7 +205,7 @@
       (n/< (get@ #day reference)
            (get@ #day sample))))
 
-(struct: #export _ (Order Date)
+(structure: #export _ (Order Date)
   (def: eq Equivalence<Date>)
   (def: < date/<)
   (def: (> reference sample)
@@ -314,7 +314,7 @@
   (-> Text (e.Error Date))
   (l.run input lex-date))
 
-(struct: #export _
+(structure: #export _
   {#.doc "Based on ISO 8601.
 
           For example: 2017-01-15"}
diff --git a/stdlib/source/lux/time/duration.lux b/stdlib/source/lux/time/duration.lux
index 5df655018..b38dfa977 100644
--- a/stdlib/source/lux/time/duration.lux
+++ b/stdlib/source/lux/time/duration.lux
@@ -41,11 +41,11 @@
     (-> Duration Duration Int)
     (i// (:representation param) (:representation subject)))
 
-  (struct: #export _ (Equivalence Duration)
+  (structure: #export _ (Equivalence Duration)
     (def: (= param subject)
       (i/= (:representation param) (:representation subject))))
 
-  (struct: #export _ (Order Duration)
+  (structure: #export _ (Order Duration)
     (def: eq Equivalence<Duration>)
     (do-template [<name> <op>]
       [(def: (<name> param subject)
@@ -77,7 +77,7 @@
 (def: #export normal-year Duration (scale 365 day))
 (def: #export leap-year Duration (merge day normal-year))
 
-(struct: #export _ (Monoid Duration)
+(structure: #export _ (Monoid Duration)
   (def: identity empty)
   (def: compose merge))
 
@@ -142,7 +142,7 @@
   (-> Text (e.Error Duration))
   (l.run input lex-duration))
 
-(struct: #export _
+(structure: #export _
   {#.doc "For example: 15D21h14m51s827ms"}
   (Codec Text Duration)
   (def: encode encode)
diff --git a/stdlib/source/lux/time/instant.lux b/stdlib/source/lux/time/instant.lux
index 4f14555f9..88058868b 100644
--- a/stdlib/source/lux/time/instant.lux
+++ b/stdlib/source/lux/time/instant.lux
@@ -46,11 +46,11 @@
     (-> duration.Duration Instant)
     (|> offset duration.to-millis :abstraction))
 
-  (struct: #export _ (Equivalence Instant)
+  (structure: #export _ (Equivalence Instant)
     (def: (= param subject)
       (:: number.Equivalence<Int> = (:representation param) (:representation subject))))
 
-  (struct: #export _ (Order Instant)
+  (structure: #export _ (Order Instant)
     (def: eq Equivalence<Instant>)
     (do-template [<name>]
       [(def: (<name> param subject)
@@ -59,7 +59,7 @@
       [<] [<=] [>] [>=]
       ))
 
-  (struct: #export _ (Enum Instant)
+  (structure: #export _ (Enum Instant)
     (def: order Order<Instant>)
     (do-template [<name>]
       [(def: <name>
@@ -298,7 +298,7 @@
   (-> Text (e.Error Instant))
   (l.run input lex-instant))
 
-## (struct: #export _
+## (structure: #export _
 ##   {#.doc "Based on ISO 8601.
 
 ##           For example: 2017-01-15T21:14:51.827Z"}
diff --git a/stdlib/source/lux/type/object/interface.lux b/stdlib/source/lux/type/object/interface.lux
index c2c54dd4f..e16a89f44 100644
--- a/stdlib/source/lux/type/object/interface.lux
+++ b/stdlib/source/lux/type/object/interface.lux
@@ -491,7 +491,7 @@
                                      ((~ g!state) (~+ g!parameters))
                                      (~ g!extension)]))))))))
 
-                  (` (struct: (~+ (csw.export export)) (~ g!struct)
+                  (` (structure: (~+ (csw.export export)) (~ g!struct)
                        (All [(~+ g!parameters) (~ g!extension)]
                          ((~ g!signature) (~+ interface-mappings)
                           ((~ g!interface) (~+ interface-mappings)
diff --git a/stdlib/source/lux/type/resource.lux b/stdlib/source/lux/type/resource.lux
index ea86f45e8..7cac8b536 100644
--- a/stdlib/source/lux/type/resource.lux
+++ b/stdlib/source/lux/type/resource.lux
@@ -34,7 +34,7 @@
   (All [keys]
     (Procedure monad [permissions keys] keys value)))
 
-(struct: (IxMonad<Procedure> Monad<m>)
+(structure: (IxMonad<Procedure> Monad<m>)
   (All [m] (-> (Monad m) (IxMonad (Procedure m))))
   
   (def: (wrap value)
diff --git a/stdlib/source/lux/type/unit.lux b/stdlib/source/lux/type/unit.lux
index b487571e1..9a5c2d054 100644
--- a/stdlib/source/lux/type/unit.lux
+++ b/stdlib/source/lux/type/unit.lux
@@ -93,7 +93,7 @@
     (wrap (list (` (type: (~+ (csw.export export)) ((~ g!scale) (~' u))
                      (~ (csw.annotations annotations))
                      (primitive (~ (code.text (scale-name name))) [(~' u)])))
-                (` (struct: (~+ (csw.export export)) (~ (code.local-symbol (format "@" name)))
+                (` (structure: (~+ (csw.export export)) (~ (code.local-symbol (format "@" name)))
                      (..Scale (~ g!scale))
                      (def: (~' scale)
                        (|>> ..out
@@ -156,11 +156,11 @@
 (unit: #export Litre)
 (unit: #export Second)
 
-(struct: #export Equivalence<Unit> (All [unit] (Equivalence (Qty unit)))
+(structure: #export Equivalence<Unit> (All [unit] (Equivalence (Qty unit)))
   (def: (= reference sample)
     (i/= (out reference) (out sample))))
 
-(struct: #export Order<Unit> (All [unit] (Order (Qty unit)))
+(structure: #export Order<Unit> (All [unit] (Order (Qty unit)))
   (def: eq Equivalence<Unit>)
   
   (do-template [<name> <func>]
@@ -172,7 +172,7 @@
     [>  i/>]
     [>= i/>=]))
 
-(struct: #export Enum<Unit> (All [unit] (Enum (Qty unit)))
+(structure: #export Enum<Unit> (All [unit] (Enum (Qty unit)))
   (def: order Order<Unit>)
   (def: succ (|>> ..out inc ..in))
   (def: pred (|>> ..out dec ..in)))
diff --git a/stdlib/source/lux/world/blob.jvm.lux b/stdlib/source/lux/world/blob.jvm.lux
index 452dc9db5..67bfded53 100644
--- a/stdlib/source/lux/world/blob.jvm.lux
+++ b/stdlib/source/lux/world/blob.jvm.lux
@@ -143,7 +143,7 @@
   (-> Nat Blob (Error Blob))
   (slice from (dec (host.array-length blob)) blob))
 
-(struct: #export _ (eq.Equivalence Blob)
+(structure: #export _ (eq.Equivalence Blob)
   (def: (= reference sample)
     (Arrays::equals [reference sample])))
 
diff --git a/stdlib/source/lux/world/file.lux b/stdlib/source/lux/world/file.lux
index 7afd12b4b..3e0a6c65e 100644
--- a/stdlib/source/lux/world/file.lux
+++ b/stdlib/source/lux/world/file.lux
@@ -130,7 +130,7 @@
                  (import: java/io/FileInputStream
                    (new [java/io/File] #io #try))
 
-                 (struct: #export JVM@System (System Process)
+                 (structure: #export JVM@System (System Process)
                    (def: &monad io.Monad<Process>)
 
                    (def: throw io.throw)
diff --git a/stdlib/test/test/lux/data/format/json.lux b/stdlib/test/test/lux/data/format/json.lux
index e630b7a49..cb90b5df5 100644
--- a/stdlib/test/test/lux/data/format/json.lux
+++ b/stdlib/test/test/lux/data/format/json.lux
@@ -125,7 +125,7 @@
 
 (derived: (poly/json.Codec<JSON,?> Record))
 
-(struct: _ (Equivalence Record)
+(structure: _ (Equivalence Record)
   (def: (= recL recR)
     (let [variant/= (function (_ left right)
                       (case [left right]