fixing super() calls, thanks to tolmasky

lib/coffee_script/nodes.rb

@@ -210,7 +210,8 @@ module CoffeeScript
 
     def compile_super(args, o)
       methname = o[:last_assign].sub(LEADING_DOT, '')
-      "this.constructor.prototype.#{methname}.call(this, #{args})"
+      arg_part = args.empty? ? '' : ", #{args}"
+      "#{o[:proto_assign]}.prototype.__proto__.#{methname}.call(this#{arg_part})"
     end
   end
 
@@ -300,6 +301,7 @@ module CoffeeScript
   # Setting the value of a local variable, or the value of an object property.
   class AssignNode < Node
     LEADING_VAR  = /\Avar\s+/
+    PROTO_ASSIGN = /\A(\S+)\.prototype/
 
     statement
     custom_return
@@ -316,9 +318,10 @@ module CoffeeScript
 
     def compile(o={})
       o = super(o)
-      name      = @variable.respond_to?(:compile) ? @variable.compile(o) : @variable
+      name      = @variable.respond_to?(:compile) ? @variable.compile(o) : @variable.to_s
       last      = @variable.respond_to?(:last) ? @variable.last.to_s : name.to_s
-      o         = o.merge(:assign => name, :last_assign => last)
+      proto     = name[PROTO_ASSIGN, 1]
+      o         = o.merge(:assign => name, :last_assign => last, :proto_assign => proto)
       postfix   = o[:return] ? ";\n#{o[:indent]}return #{name}" : ''
       return write("#{@variable}: #{@value.compile(o)}") if @context == :object
       return write("#{name} = #{@value.compile(o)}#{postfix}") if @variable.properties? && !@value.custom_assign?

test/fixtures/execution/calling_super.cs

@@ -0,0 +1,23 @@
+Base: => .
+Base.prototype.func: string =>
+  'zero/' + string.
+
+FirstChild: => .
+FirstChild.prototype.__proto__: new Base()
+FirstChild.prototype.func: string =>
+  super('one/') + string.
+
+SecondChild: => .
+SecondChild.prototype.__proto__: new FirstChild()
+SecondChild.prototype.func: string =>
+  super('two/') + string.
+
+ThirdChild: => .
+ThirdChild.prototype.__proto__: new SecondChild()
+ThirdChild.prototype.func: string =>
+  super('three/') + string.
+
+result: (new ThirdChild()).func('four')
+
+print(result is 'zero/one/two/three/four')
+

test/fixtures/execution/calling_super.js

@@ -0,0 +1,27 @@
+(function(){
+  var Base = function() {
+  };
+  Base.prototype.func = function(string) {
+    return 'zero/' + string;
+  };
+  var FirstChild = function() {
+  };
+  FirstChild.prototype.__proto__ = new Base();
+  FirstChild.prototype.func = function(string) {
+    return FirstChild.prototype.__proto__.func.call(this, 'one/') + string;
+  };
+  var SecondChild = function() {
+  };
+  SecondChild.prototype.__proto__ = new FirstChild();
+  SecondChild.prototype.func = function(string) {
+    return SecondChild.prototype.__proto__.func.call(this, 'two/') + string;
+  };
+  var ThirdChild = function() {
+  };
+  ThirdChild.prototype.__proto__ = new SecondChild();
+  ThirdChild.prototype.func = function(string) {
+    return ThirdChild.prototype.__proto__.func.call(this, 'three/') + string;
+  };
+  var result = (new ThirdChild()).func('four');
+  print(result === 'zero/one/two/three/four');
+})();