abstract out the kind of environment classifiers (ECKind)

[coq-hetmet.git] / src / HaskKinds.v

diff --git a/src/HaskKinds.v b/src/HaskKinds.v
index b61ed07..2200f51 100644 (file)
--- a/src/HaskKinds.v
+++ b/src/HaskKinds.v
@@ -12,7 +12,6 @@ Variable Note                : Type.                         Extract Inlined Con
 Variable natToString         : nat         -> string.        Extract Inlined Constant natToString => "natToString".
 Instance NatToStringInstance : ToString nat := { toString := natToString }.
 
-(* Figure 7: production κ, ι *)
 Inductive Kind : Type := 
   | KindStar          : Kind                      (* ★  - the kind of coercions and the kind of types inhabited by [boxed] values *)
   | KindArrow         : Kind  -> Kind  -> Kind    (* ⇛  - type-function-space; things of kind X⇛Y are NOT inhabited by expressions*)
@@ -38,6 +37,10 @@ Instance KindToString : ToString Kind := { toString := kindToString }.
 Notation "'★'"   := KindStar.
 Notation "a ⇛ b" := (KindArrow a b).
 
+(* the kind of environment classifiers *)
+Definition ECKind := ★ .  
+Opaque ECKind.
+
 Fixpoint kindToLatexMath (k:Kind) : LatexMath :=
   match k with
   | ★                            => rawLatexMath "\star"