Issue #860. Nested classes.

lib/nodes.js

@@ -977,6 +977,9 @@
     Class.prototype.walkBody = function(name) {
       return this.traverseChildren(false, __bind(function(child) {
         var exps, i, node, _len, _ref;
+        if (child instanceof Class) {
+          return false;
+        }
         if (child instanceof Expressions) {
           _ref = exps = child.expressions;
           for (i = 0, _len = _ref.length; i < _len; i++) {

src/nodes.coffee

@@ -786,6 +786,7 @@ exports.Class = class Class extends Base
   # Walk the body of the class, looking for prototype properties to be converted.
   walkBody: (name) ->
     @traverseChildren false, (child) =>
+      return false if child instanceof Class
       if child instanceof Expressions
         for node, i in exps = child.expressions
           if node instanceof Value and node.isObject(true)

test/test_classes.coffee

@@ -318,3 +318,16 @@ class two.Klass
 eq typeof Klass, 'undefined'
 eq one.Klass.label, 'one'
 eq two.Klass.label, 'two'
+
+
+# Nested classes.
+class Outer
+  constructor: ->
+    @label = 'outer'
+
+  class @Inner
+    constructor: ->
+      @label = 'inner'
+
+eq (new Outer).label, 'outer'
+eq (new Outer.Inner).label, 'inner'