diff --git a/internal/types2/array.go b/internal/types2/array.go
new file mode 100644
index 00000000..34f59d1b
--- /dev/null
+++ b/internal/types2/array.go
@@ -0,0 +1,21 @@
+package types2
+
+// An Array represents an array type.
+type Array struct {
+	len  int
+	elem Type
+}
+
+// NewArray returns a new array type for the given element type and length.
+// A negative length indicates an unknown length.
+func NewArray(elem Type, len int) *Array { return &Array{len: len, elem: elem} }
+
+// Len returns the length of array a.
+// A negative result indicates an unknown length.
+func (a *Array) Len() int { return a.len }
+
+// Elem returns element type of array a.
+func (a *Array) Elem() Type { return a.elem }
+
+func (t *Array) Underlying() Type { return t }
+func (t *Array) String() string   { return "@TBI" }
diff --git a/internal/types2/types.go b/internal/types2/types.go
index 71213e6c..4d61af56 100644
--- a/internal/types2/types.go
+++ b/internal/types2/types.go
@@ -117,26 +117,6 @@ func (b *Basic) Name() string { return b.name }
 func (t *Basic) Underlying() Type { return t }
 func (b *Basic) String() string   { return b.name }
 
-// An Array represents an array type.
-type Array struct {
-	len  int
-	elem Type
-}
-
-// NewArray returns a new array type for the given element type and length.
-// A negative length indicates an unknown length.
-func NewArray(elem Type, len int) *Array { return &Array{len: len, elem: elem} }
-
-// Len returns the length of array a.
-// A negative result indicates an unknown length.
-func (a *Array) Len() int { return a.len }
-
-// Elem returns element type of array a.
-func (a *Array) Elem() Type { return a.elem }
-
-func (t *Array) Underlying() Type { return t }
-func (t *Array) String() string   { return "@TBI" }
-
 type Slice struct {
 	elem   Type
 	IsElps bool