Simplify module inclusion for `Array`, `Hash` and `Range`.

mrblib/array.rb

@@ -4,7 +4,6 @@
 #
 # ISO 15.2.12
 class Array
-
   ##
   # Calls the given block for each element of +self+
   # and pass the respective element.
@@ -193,13 +192,6 @@ class Array
     return block.call if ret.nil? && block
     ret
   end
-end
-
-##
-# Array is enumerable
-class Array
-  # ISO 15.2.12.3
-  include Enumerable
 
   ##
   # Sort all elements and replace +self+ with these
@@ -277,4 +269,9 @@ class Array
     self
   end
   alias entries to_a
+
+  ##
+  # Array is enumerable
+  # ISO 15.2.12.3
+  include Enumerable
 end

mrblib/hash.rb

@@ -3,6 +3,12 @@
 #
 # ISO 15.2.13
 class Hash
+  ##
+  # Hash is enumerable
+  #
+  # ISO 15.2.13.3
+  include Enumerable
+
   ##
   #  Equality---Two hashes are equal if they each contain the same number
   #  of keys and if each key-value pair is equal to (according to
@@ -297,11 +303,3 @@ class Hash
     h
   end
 end
-
-##
-# Hash is enumerable
-#
-# ISO 15.2.13.3
-class Hash
-  include Enumerable
-end

mrblib/range.rb

@@ -3,6 +3,11 @@
 #
 # ISO 15.2.14
 class Range
+  ##
+  # Range is enumerable
+  #
+  # ISO 15.2.14.3
+  include Enumerable
 
   ##
   # Calls the given block for each element of +self+
@@ -80,11 +85,3 @@ class Range
   end
   alias entries to_a
 end
-
-##
-# Range is enumerable
-#
-# ISO 15.2.14.3
-class Range
-  include Enumerable
-end