removed all traces of 'extends' -- it's not any shorter or more convenient than just setting the prototype

lib/coffee_script/CoffeeScript.tmbundle/Syntaxes/CoffeeScript.tmLanguage

@@ -229,7 +229,7 @@
 		</dict>
 		<dict>
 			<key>match</key>
-			<string>\b(super|this|extends)\b</string>
+			<string>\b(super|this)\b</string>
 			<key>name</key>
 			<string>variable.language.cs</string>
 		</dict>

lib/coffee_script/grammar.y

@@ -10,7 +10,7 @@ token TRY CATCH FINALLY THROW
 token BREAK CONTINUE
 token FOR IN WHILE
 token SWITCH CASE
-token EXTENDS SUPER
+token SUPER
 token DELETE
 token NEWLINE
 token COMMENT
@@ -30,7 +30,7 @@ prechigh
   right    DELETE
   left     "."
   right    THROW FOR IN WHILE NEW
-  left     UNLESS IF ELSE EXTENDS
+  left     UNLESS IF ELSE
   left     ":"
   right    RETURN
 preclow
@@ -69,7 +69,6 @@ rule
   | Call
   | Code
   | Operation
-  | Extend
   ;
 
   # We have to take extra care to convert these statements into expressions.
@@ -255,11 +254,6 @@ rule
     SUPER "(" ArgList ")"             { result = CallNode.new(:super, val[2]) }
   ;
 
-  # Extending a class.
-  Extend:
-    IDENTIFIER EXTENDS Expression     { result = ExtendNode.new(val[0], val[2]) }
-  ;
-
   # The array literal.
   Array:
     "[" ArgList "]"                   { result = ArrayNode.new(val[1]) }

lib/coffee_script/lexer.rb

@@ -14,7 +14,7 @@ module CoffeeScript
                   "break", "continue",
                   "for", "in", "while",
                   "switch", "case",
-                  "extends", "super",
+                  "super",
                   "delete"]
 
     # Token matching regexes.

lib/coffee_script/nodes.rb

@@ -213,21 +213,6 @@ module CoffeeScript
     end
   end
 
-  class ExtendNode < Node
-
-    attr_reader :subclass, :superclass
-
-    def initialize(subclass, superclass)
-      @subclass, @superclass = subclass, superclass
-    end
-
-    def compile(o={})
-      o = super(o)
-      "#{@subclass}.prototype = #{@superclass.compile(o)}"
-    end
-
-  end
-
   # A value, indexed or dotted into, or vanilla.
   class ValueNode < Node
     attr_reader :literal, :properties, :last